Very slow wake up and two log in screens

Hello. I've been experiencing this issue for months and would appreciate suggestions since I haven't seen other entries related to this specifically. When my MacBook Pro (2012), OS X 10.10.2 wakes from sleep, it shows a sort of "progress bar" over a grayed-out screen, but quickly goes to a login screen where I choose either my or a guest account. I type in my password, and instead of taking me to my desktop, the problems begin. The screen goes black for 2-3 minutes, then lights up with a login screen featuring just my name (not showing the guest account option like before), but I can't put my password in for at least another minute--both the mouse on the screen and the keyboard are frozen. It usually takes 4-5 minutes to wake from sleep, longer even than turning on completely!

P.s. I'm not technologically-inclined, so simple explanations/directions would be great!