I find this so ridiculous - both as someone who has worked in research psychology and as a person who, like many others, has a bed and likes to sleep... If we

I find this so ridiculous - both as someone who has worked in research psychology and as a person who, like many others, has a bed and likes to sleep... If we were such simple creatures that we could be so easily conditioned to not sleep because of previous non-sleep activities in bed, sex of all things would be one of the biggest drivers of insomnia. It produces a significant reward and we're very much wired to want it - as such, it would make a powerful unconditioned stimulus if anything could. Therefore, the previous poster's claim isn't even valid on its face. Sex should absolutely be done elsewhere if we're so easily conditioned away from sleep. Instead, I'd substitute the idea that things like light exposure do matter (so tv and digital tools are often counter to falling asleep). Another useful idea is the rule of thumb that if you're trying to sleep but can't, after some period of time of tossing and turning, get up, keep the lights dim but do something else and come back in a little bit and try to get yourself in the sleep groove again. It's conceptually not so different from a pilot aborting a landing and going around again, I guess.