I have read before that orgasms make females more alert, and males more sleepy. True in my case.

The sleep, no I dont feel squeeezing aroundnthe heart. Or anxious, I just feel normal, maybe a bit of brain fog if its been really bad for a few days. I do get a faint feeling, an feels like my heart is beating faster. People sleep for 8-9 hours??! Kidding, but I get about 4 hours or so a night if I am lucky.