Well you know what they say ... "There is no such thing as a free lunch". I usually get to bed by 9:30ish. Any later and you'll start feeling it on the bike.
It depends on how much sleep you're used to. Problem is, by 8:30 in the evening, you're just about ready for bed. (Although I often go out to play action cricket later (about 9ish) so after the third day, I'll struggle to stay awake beyond 9pm. ie. Monday - Sleep in (Up at 6am). Tuesday, up early and to bed by 9:30. Wednesday - either sleep in or up early. (Depends if I've agreed to do the recovery ride) but always to bed by 9:30 (unless I have action cricket) Thursday - up early and I usually crash at around 9ish. Sleep in Friday. (I usually try to get at least 7 hours sleep a night.