It's not about simulating a sleep schedule, if they ever look into your account as much as to see how much you log off - you'll already be banned. You want to stay under the radar, some tips: Bot during their off-times, so you won't be banned by them aimlessly searching for bots. This is assuming you're botting a hot spot, which most likely you are.
So GMT time, 8 PM to 6 AM.
And from there, do break times ever 2 hours, for 30 minutes.
That's my two cents.