Still waking up

My sleep wasn't great yesterday. I woke up too early and, unusually for me, resorted to taking a nap on the sofa in the early afternoon. Last night I was probably asleep by 23h but awake by 4h. I got up for a while and drank a peppermint tisane but went back to bed at 5h30 and managed to sleep for a couple of hours more before I had to drag myself back out of bed to start to wake up, ready for a new workday.

Typically I believe it to be others' activity that wakes me up prematurely. However, this time I think it was the heating. We have not much needed it until recently, and still not much now, but I suspect the temperature change, from what triggered it to how much it had heated the bedroom once done, might have disturbed me enough; I felt hot and was probably wrapped for the cooler temperature.