I go up to bed between 10pm-midnight, tired. I have a bath, go to bed and read a book (paper, not kindle/tablet/phone) but I can't get to sleep.
I've tried milky drinks and it's not helped.
I'll be awake until 3am sometimes and give up and go downstairs because I'm sick of lying in bed awake. I take the DCs to school then come home (I haven't gone back to work yet as I finished my job before xmas and am looking for a new one) and sometimes I end up going back to bed for 2-3 hours because I am so shattered. I've tried not to do this but it makes no difference. Then I work but get a period around 4-6 where I am bone crushingly exhausted but get through it and am fine for the rest of the day.
and repeat. I haven't had a good night sleep in ages.