She was adamant that she would never sleep more than that specific time because it works well with her circadian rhythms – an internal process that regulates the sleep–wake cycle.
“No longer because I feel terrible and I do feel terrible if I have longer,” she nodded, having obviously learnt the tough way of trying to steal a few more hours sleep during the day.
“But that’s the one bit that gets me, it’s kind of like I know I have to do that because otherwise I just wouldn’t function,” she shrugged.
“I go to bed about 9:30pm at night, but I’ve got family.
source: express.co.uk