Originally Posted by Dilman
Thanks, so you don't think I'll become tired after the nap, leading up to the core sleep?
I don't think so, as you'd be having a longer core sleep (6 hours instead of 4.5). Try it and see; you can always add a second short (15-20 mins) nap if needed.
In my case, I have a core sleep of 4.5 hours and it lasts about 12 hours OK until the nap. An 80 minute nap then keeps me going until the next core sleep.
Occasionally, though, I have a night of monophasic sleep (if I'm out somewhere, for example). I don't really miss the nap, and I just have 7.5 hours straight. No problem at all.