I'm also having this issue, with a late 2013 13" MacBook Pro (Dual-Core i5, 8GB RAM, 256GB SSD). I didn't even notice it until my computer was making an odd noise, opened it up to it booted in Windows when I had closed it in MacOS, restarted it and that's the error code that showed up.
Error Code is as follows:
Sleep Wake failure in EFI
Failure code:: 0xffffffff 0x0000001f
Please IGNORE the below stackshot
================================================================
Date/Time: 2020-04-22 22:18:41 -0700
OS Version: ??? ??? (Build ???)
Architecture: x86_64
Report Version: 29
Data Source: Stackshots
Shared Cache: 0x42d5000 10001308-B6C7-3E2E-B570-2F9B1F9663C4
Event: Sleep Wake Failure
Duration: 0.00s
Steps: 1
Time Awake Since Boot: 33s
Process: swd [295]
Architecture: x86_64
Footprint: 380 KB
Start time: 2020-04-22 22:18:41 -0700
End time: 2020-04-22 22:18:41 -0700
Num samples: 1 (1)
Thread 0x755 1 sample (1) priority 4 (base 4)
<thread QoS background (requested background), thread darwinbg, process darwinbg, IO tier 2>
1 start + 1 (libdyld.dylib + 109769) [0x7fff6b3dccc9] 1
1 ??? [0x10d65e454] 1
1 ??? [0x10d65e1dd] 1
1 __stack_snapshot_with_config + 10 (libsystem_kernel.dylib + 135862) [0x7fff6b53e2b6] 1
*1 ??? [0xffffff80002c8206] 1
*1 ??? [0xffffff80009875f7] 1
*1 ??? [0xffffff80008a0001] 1
*1 ??? [0xffffff80002eb9e7] (running) 1
Binary Images:
0x7fff6b3c2000 - 0x7fff6b3f8fff libdyld.dylib (750.5) <D2A07EF5-A64B-3692-BE13-89DAA2EC5E80> /usr/lib/system/libdyld.dylib
0x7fff6b51d000 - 0x7fff6b549fff libsystem_kernel.dylib (6153.101.6) <E76440E1-D1E8-3D9A-8B47-D01F554FF1C4> /usr/lib/system/libsystem_kernel.dylib
Model: MacBookPro11,1, BootROM 159.0.0.0.0, 2 processors, Dual-Core Intel Core i5, 2.4 GHz, 8 GB, SMC 2.16f68
Graphics: kHW_IntelIrisItem, Intel Iris, spdisplays_builtin
Memory Module: BANK 0/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453120
Memory Module: BANK 1/DIMM0, 4 GB, DDR3, 1600 MHz, 0x802C, 0x384B54463531323634485A2D314736453120
AirPort: spairport_wireless_card_type_airport_extreme (0x14E4, 0x112), Broadcom BCM43xx 1.0 (7.77.111.1 AirPortDriverBrcmNIC-1600.4)
Bluetooth: Version 7.0.4f6, 3 services, 27 devices, 1 incoming serial ports
Network Service: Wi-Fi, AirPort, en0
Serial ATA Device: APPLE SSD SD0256F, 251 GB
USB Device: USB 3.0 Bus
USB Device: Apple Internal Keyboard / Trackpad
USB Device: BRCM20702 Hub
USB Device: Bluetooth USB Host Controller
Thunderbolt Bus: MacBook Pro, Apple Inc., 17.2