If it's worth saying, but not worth its own post (even in Discussion), then it goes here.
Notes for future OT posters:
1. Please add the 'open_thread' tag.
2. Check if there is an active Open Thread before posting a new one. (Immediately before; refresh the list-of-threads page before posting.)
3. Open Threads should be posted in Discussion, and not Main.
4. Open Threads should start on Monday, and end on Sunday.
Such an open question on FB is bound to show selection effects. Better to do a straight poll:
I prefer to go to sleep [pollid:1134]
I prefer to wake up [pollid:1135]
I have to go to sleep [pollid:1136]
I have to wake [pollid:1137]
For comparison: http://www.frontiersin.org/files/Articles/93218/fneur-05-00081-HTML/image_m/fneur-05-00081-g001.jpg