If i have less than about five hours kip i’d pull a sicky. My head would be up my arse to such an extent that it’d be in nobody’s best interests for me to go in. I need seven hours to function. If you go in work it just looks like you’ve been out on the piss all night, let’s be honest. Depends on what you do, though, if you have a passive data entry job or something you might be able to wing it, but anything where you could make mistakes or anything public-facing i’d prefer people to not come in.
I always struggle to sleep on a Sunday night (or a Monday night on a bank holiday weekend). Tried everything - get up at normal time on the days before, don’t booze on the Saturday (Sunday) night, don’t have brews, come offline early, but wide awake for hours and hours. Proper headfuck because in almost all jobs Monday’s your busiest day.