There is such a thing as evening/nighttime dimentia. Thoughts get jumbled, you get lethargic and you come across like you are drunk. My father-in-law has it and every evening its like the weirdest thing. So I guess it might be possible to have some sort of depression like that
I have read somewhere that people tend to get more depressed and feel lonely at night time than though the day. Not sure if it is a condition that has a name but it makes sense to me.
try to get at least 8 hours of uninterruped sleep. when i cant sleep i have bad fatigue. sleep is good.
Could it be you were: awake all day,working,chasing kids about.The night time is the right time to catch the zzzzzzzzzzzzzzz Happy Nappy!!