I now know the importance of going to bed early. Yesterday I came home from work, put my son to bed, and wanted to do nothing. I was trying to work out why... I have been so motivated recently, what has sapped it? Then it came to me; the night before, I hadn't gone to bed until 11.30, and my son woke us at 6am. Six and a half hours is obviously not enough sleep for me!
The advantage of being up so early was that I got a lot of my evening routine (emptying & loading the dishwasher and washing machine) done before I went to work, meaning I didn't really have anything that absolutely needed doing, so I took it easy and went to bed at 9 o'clock! Hopefully now that I am well rested tonight will be a different story!