Is it normal to think on bed instead of sleeping even if you are tired

I had a lot of work to be done the other day and after doing that all I had the night to rest. Eventhough I was tired and sleepy, and my whole body aching, I was just lying on bed fantasizing stuff and feeling proud of myself for doing all that work by myself. Through the thinking process this thought hit me 'what the hell am I doing, I could just fall into deep sleep in a minute if I tried but instead of doing that why am I wasting my time thinking random shit?' I was enjoying thinking more than sleeping. Is that normal? I love sleeping and I live alone.