Currently I don't sleep through the night - I tend to have short spells of deep sleep generally ended by need for a toilet break. It no longer bothers me as being retired I can now sleep whenever the need takes me. I find too that low carbing has switched my brain to ON and it's difficult to change this.
I've also found that illness, pain and stress can often completely disrupt my sleep patterns and this sometimes sets my body clock round to back-to-front time, which started long before I was ever diabetic though. But I've never even thought of needing to monitor my sleep and I don't necessarily feel tired if I don't sleep when I probably should.
Robbity