no of hours of sleep?

..........

 

For me it didn't as I need to get up at a certain time. It was almost never a quick session for me and starting PM late in the evening meant I got less sleep. Getting to O would have been easy physically but I just loved the whole process and didn't want to end it too soon.

I've sometimes used MO as a sleeping aid and had some success with that. I don't think I'll use it again to reduce the risk of relapsing back to PMO.

 

I found that it decreases hours of sleep. At least for me anyway.. I used to average 6 hours a night. Now im down to 4 hours..

 

When men orgasm they release chemicals which cause fatigue, so I would guess that it increases the feeling of tiredness.

"Research shows that during ejaculation, men release a cocktail of brain chemicals, including norepinephrine, serotonin, oxytocin, vasopressin, nitric oxide (NO), and the hormone prolactin. The release of prolactin is linked to the feeling of sexual satisfaction, and it also mediates the “recovery time” that men are well aware of—the time a guy must wait before “giving it another go.” Studies have also shown that men deficient in prolactin have faster recovery times.

Prolactin levels are naturally higher during sleep, and animals injected with the chemical become tired immediately. This suggests a strong link between prolactin and sleep, so it’s likely that the hormone’s release during orgasm causes men to feel sleepy.

(Side note: prolactin also explains why men are sleepier after intercourse than after masturbation. For unknown reasons, intercourse orgasms release four times more prolactin than masturbatory orgasms, according to a recent study.)

Oxytocin and vasopressin, two other chemicals released during orgasm, are also associated with sleep. Their release frequently accompanies that of melatonin, the primary hormone that regulates our body clocks. Oxytocin is also thought to reduce stress levels, which again could lead to relaxation and sleepiness."


http://scienceline.org/2006/09/ask-wenner-sex/