This happened again this morning. Here are the Apple System Log (ASL) Messages at the time:
2015-May-01 11:13:36 kernel[0]: AirPort_Brcm43xx::powerChange: System Wake - Full Wake/ Dark Wake / Maintenance wake
2015-May-01 11:13:36 kernel[0]: RTC: PowerByCalendarDate setting ignored
2015-May-01 11:13:36 kernel[0]: RTC: PowerByCalendarDate setting ignored
2015-May-01 11:13:36 kernel[0]: Previous sleep cause: 5
2015-May-01 11:13:36 kernel[0]: The USB device Apple Internal Keyboard / Trackpad (Port 3 of Hub at 0x6000000) may have caused a wake by issuing a remote wakeup (2)
2015-May-01 11:13:36 kernel[0]: full wake promotion (reason 1) 108 ms
2015-May-01 11:13:36 watchdogd[213]: [watchdog_daemon] @( pm_callback) - ref=0x0 msg_type=0xe0000320 msg=0x0
2015-May-01 11:13:36 kernel[0]: wlEvent: en1 en1 Link DOWN virtIf = 0
2015-May-01 11:13:36 kernel[0]: AirPort: Link Down on en1. Reason 8 (Disassociated because station leaving).
2015-May-01 11:13:36 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:36 kernel[0]: en1::IO80211Interface::postMessage bssid changed
2015-May-01 11:13:36 kernel[0]: en1: 802.11d country code set to 'X0'.
2015-May-01 11:13:36 kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140 149 153 157 161 165
2015-May-01 11:13:36 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv4 listener multicast send failed en1, 50
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 50, fd 69, ErrLogCount 1 ResolverIntf:5
2015-May-01 11:13:36 sharingd[277]: 11:13:36.321 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 2 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 96, ErrLogCount 3 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 4 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 5 ResolverIntf:5
2015-May-01 11:13:36 discoveryd[51]: Basic DNSResolver UDNS Send(): UDP Sendto() failed to DNSNameServer 192.168.1.254 Port 53 errno 49, fd 95, ErrLogCount 6 ResolverIntf:5
2015-May-01 11:13:36 configd[26]: setting hostname to "John-Nixons-MacBook-Pro.local"
2015-May-01 11:13:36 configd[26]: network changed: v4(en1-:192.168.1.123) DNS- Proxy-
2015-May-01 11:13:36 discoveryd[51]: Basic WABServer NetResolverEvent no resolvers, resetting domains
2015-May-01 11:13:36 UserEventAgent[16]: Captive: CNPluginHandler en1: Inactive
2015-May-01 11:13:36 discoveryd[51]: Basic Warn DD_Warn: Corrupt NSEC RDATA size
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:36 WindowServer[136]: handle_will_sleep_auth_and_shield_windows: NULL shield_window (lock state: 1)
2015-May-01 11:13:36 WindowServer[136]: CGXDisplayDidWakeNotification [346636855129711]: posting kCGSDisplayDidWake
2015-May-01 11:13:36 discoveryd[51]: Basic Bonjour Failed to delete registration recordId=119 error=4
2015-May-01 11:13:37 kernel[0]: en1: 802.11d country code set to 'GB'.
2015-May-01 11:13:37 kernel[0]: en1: Supported channels 1 2 3 4 5 6 7 8 9 10 11 12 13 36 40 44 48 52 56 60 64 100 104 108 112 116 120 124 128 132 136 140
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:37 sharingd[277]: 11:13:37.246 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:37 sharingd[277]: 11:13:37.284 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 1
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 netbiosd[4354]: network_reachability_changed : network is not reachable, netbiosd is shutting down
2015-May-01 11:13:37 discoveryd[51]: Basic Bonjour,Warn Warning: IPv6 listener multicast send failed en1, 49
2015-May-01 11:13:37 kernel[0]: MacAuthEvent en1 Auth result for: 4c:09:d4:15:e8:39 MAC AUTH succeeded
2015-May-01 11:13:37 kernel[0]: wlEvent: en1 en1 Link UP virtIf = 0
2015-May-01 11:13:37 kernel[0]: AirPort: Link Up on en1
2015-May-01 11:13:37 kernel[0]: en1: BSSID changed to 4c:09:d4:15:e8:39
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 48,-1
2015-May-01 11:13:37 kernel[0]: en1::IO80211Interface::postMessage bssid changed
2015-May-01 11:13:37 kernel[0]: AirPort: RSN handshake complete on en1
2015-May-01 11:13:37 configd[26]: network changed: DNS* Proxy
2015-May-01 11:13:37 UserEventAgent[16]: Captive: [CNInfoNetworkActive:1709] en1: SSID 'BTHub4-H2J5' making interface primary (cache indicates network not captive)
2015-May-01 11:13:37 UserEventAgent[16]: Captive: CNPluginHandler en1: Evaluating
2015-May-01 11:13:37 UserEventAgent[16]: Captive: en1: Not probing 'BTHub4-H2J5' (cache indicates not captive)
2015-May-01 11:13:37 configd[26]: network changed: v4(en1!:192.168.1.123) DNS+ Proxy+ SMB
2015-May-01 11:13:37 UserEventAgent[16]: Captive: CNPluginHandler en1: Authenticated
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 networkd[141]: +[NETLedBelly stopFastFail] Clearing ledbelly failure cache
2015-May-01 11:13:37 kernel[0]: en1: BSSID changed to 4c:09:d4:15:e8:39
2015-May-01 11:13:37 kernel[0]: en1: channel changed to 48,-1
2015-May-01 11:13:37 sharingd[277]: 11:13:37.880 : SDStatusMonitor::kStatusWirelessPowerChanged
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x42731c0
2015-May-01 11:13:38 WindowServer[136]: Found 18 modes for display 0x042731c0 [18, 0]
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x746050c5
2015-May-01 11:13:38 WindowServer[136]: Found 2 modes for display 0x746050c5 [2, 0]
2015-May-01 11:13:38 WindowServer[136]: disable_update_timeout: UI updates were forcibly disabled by application "Finder" for over 1.00 seconds. Server has re-enabled them.
2015-May-01 11:13:38 WindowServer[136]: common_reenable_update: UI updates were finally reenabled by application "Finder" after 1.65 seconds (server forcibly re-enabled them after 1.64 seconds)
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x42731c0
2015-May-01 11:13:38 WindowServer[136]: Found 18 modes for display 0x042731c0 [18, 0]
2015-May-01 11:13:38 WindowServer[136]: Received display connect changed for display 0x31000001
2015-May-01 11:13:38 WindowServer[136]: Found 2 modes for display 0x31000001 [2, 0]
2015-May-01 11:13:38 WindowServer[136]: Display 0x042731c0: GL mask 0x1; bounds (0, 0)[1280 x 800], 18 modes available
Main, Active, on-line, enabled, built-in, boot, OpenGL-accel, Vendor 610, Model 9cc7, S/N 0, Unit 0, Rotation 0
UUID 0xcb5a19e16c20c98ebb2d70fc3bb550b4, ColorSpace { 1632878172 }
2015-May-01 11:13:38 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:38 WindowServer[136]: Display 0x31000001: GL mask 0x2; bounds (1280, 0)[640 x 480], 2 modes available
Active, on-line, enabled, OpenGL-accel, Vendor 3ac4, Model 0, S/N 0, Unit 1, Rotation 0
UUID 0x5a88aeaaae3bbb86e9aec154726397dd, ColorSpace { 1331579117 }
2015-May-01 11:13:38 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:38 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Adobe Reader" for synchronous notification type 100 (kCGSDisplayWillReconfigure) (CID 0x20243, PID 2268)
2015-May-01 11:13:38 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Console" for synchronous notification type 100 (kCGSDisplayWillReconfigure) (CID 0x16403, PID 262)
2015-May-01 11:13:39 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Notification Center" for synchronous notification type 109 (<unknown>) (CID 0x14d13, PID 361)
2015-May-01 11:13:39 WindowServer[136]: CGError post_notification(const CGSNotificationType, void *const, const size_t, const bool, const CGSRealTimeDelta, const int, const CGSConnectionID *const, const pid_t): Timed out 0.250 second wait for reply from "Activity Monitor" for synchronous notification type 109 (<unknown>) (CID 0xa26b, PID 261)
2015-May-01 11:13:39 WindowServer[136]: Display 0x042731c0: Unit 0: Mode 640 x 480, CGSThirtytwoBitColor, Resolution 1, ioModeID 0x80003006, ioModeDepth 0x2, IOReturn 0x0
2015-May-01 11:13:39 WindowServer[136]: hw_mirror_device_if_possible: driver picks 0x31000001 as primary
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display mode changed
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display added
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Display removed
2015-May-01 11:13:39 WindowServer[136]: CGXDisplaysDidReconfigure: Displays mirrored
2015-May-01 11:13:39 WindowServer[136]: Display 0x31000001: GL mask 0x2; bounds (0, 0)[640 x 480], 2 modes available
Master in mirror set; Main, Active, on-line, enabled, OpenGL-accel, Vendor 3ac4, Model 0, S/N 0, Unit 1, Rotation 0
UUID 0x5a88aeaaae3bbb86e9aec154726397dd, ColorSpace { 1331579117 }
2015-May-01 11:13:39 WindowServer[136]: GLCompositor: GL renderer id 0x0102261a, GL mask 0x00000003, accelerator 0x000036cf, unit 0, caps QEX|MIPMAP, vram 256 MB
texture max 8192, viewport max {8192, 8192}, extensions NPOT|GLSL|FLOAT
2015-May-01 11:13:39 WindowServer[136]: Display 0x042731c0: GL mask 0x1; bounds (0, 0)[640 x 480], 18 modes available
Hardware mirror of 0x31000001; on-line, enabled, built-in, boot, Vendor 610, Model 9cc7, S/N 0, Unit 0, Rotation 0
UUID 0xcb5a19e16c20c98ebb2d70fc3bb550b4, ColorSpace { 1632878172 }
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: notification observer: com.apple.iChat notification: __CFNotification 0x7f960b4aaee0 {name = _NSDoNotDisturbDisabledNotification}
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: NC Disabled: NO
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: DND Enabled: NO
2015-May-01 11:13:40 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: Updating enabled: YES (Topics: (
))
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:40 WindowServer[136]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'. Run with arg = -discovery
2015-May-01 11:13:41 identityservicesd[224]: <IMMacNotificationCenterManager: 0x7f960b460af0>: notification observer: com.apple.iChat notification: __CFNotification 0x7f960b44dd70 {name = _NSDoNotDisturbEnabledNotification}