This is lighthearted! I'm staying on a friend's couch for a couple of days as he lives mid-way between me and where I'm going on holiday. He has a small studio so I had the couch but we slept in the same room iyswim (relevant!).
He's just started a new job, think shift work at a fast food type place. Worked yesterday, and as I work freelance, I just brought my laptop and worked while he was out. He got in at just after 11pm. We had food, chatted, watched a film, but he just wouldn't/couldn't wind down. Tells me he normally goes to sleep around 2am. Eventually settled down at 4am. My work pattern means I tend to work through the night and sleep more in the day so he said it was fine for me to continue working (the fan he had on full blast was louder than any keyboard or mouse clicks before anyone says anything!).
The man slept. He snored. He farted. He slept some more. I crashed out around 10am, his alarm was set for 11am (today's shift started at 4pm - 10 mins drive away).
Alarm goes off, 'ugh I hardly slept at all!'.
I know he slept! I could see him sleeping!! But he was having none of it. Reset his alarm for 12:30pm and went back to sleep, muttering about he'd had no sleep and was so tired...
When he woke up he was really grumpy and moaning. And then said he was going to call work and say he wasn't going in because he was tired!!
He's still in training/on probation. I reminded him at best it won't look good and worst they'll just get rid of him. Cue whiny child but I'm tirrrrreeeeddd I won't be able to be at my best! Well, better to be at 80% it's only a 6 hour shift, than be at 0% cos you didn't go in and now look lazy/unreliable?!
I made him go in 
. But seriously, this man wants a baby. Has it just never occurred to him that he would have far less sleep with a screaming newborn?! Sleep deprivation is terrible, but it was one. night. I despair.
He's 35 btw.