My grandmother was a chronic insomniac. Between postings abroad we used to stay with my grandparents, it was out second home. My memories of her include us having to be very quiet in the mornings until about 10am. This was because she wouldn't have got to sleep until about 3am. She used to get up and make tea, wake someone up [accidentally] and that person would end up drinking tea too. How she would have loved all night T.V.
Sadly, my daughter seems to have inherited that trait. I'm fine just as long as I am able to read for about an hour, and a cup of Horlicks, before turning off the light.