I have been on the sick for a week, so I reckon sat doing nowt through the day means I aint tired at night.
Nail hit firmly on the head there!
Don’t underestimate the power of (regular) exercise…
Read up quite a lot on this years ago (I’ve suffered insomnia a lot in the past) and the theory is the human body clock has something like a 25hr natural cycle. So unless we actually tire ourselves out physically and mentally to some extent every day, then our body clock shifts back… In some people this kind of behaviour is far more naturally prevalent than others (I know people that can fall asleep at 10pm on the dot every day regardless). When I was long term sick with PVF/CFS a couple of years ago, every 2-3 weeks I’d lose a day, I’d gradually become nocturnal over a period of a week or so, then get to the point I was waking up at 6-7pm (to then go to bed at like 10am) so at that pint I’d force myself to stay awake then til 11pm that night to then sleep through til 8am to return (briefly) to normality.
I’ve had a bad week this week actually sleep wise (though I’ve actually just got in from a night out oddly enough, first in months, though I still won’t sleep yet cos of the week I’ve had), where cos I’ve not had the time to exercise when the weather has been good, and then the weather has been bad for most of it (and I’ve not fancied riding in driving rain), coupled with not actually having a proper job at the moment, and my mind is wandering a lot, and my feet get itchy and restless!
Sadly, I’ve got all too used to it… You’ll probably be lucky enough to go back to a regular sleeping pattern as soon as you’re back at work!