Sleepy bee on a sunflower

I have been a bit negligent in posting recently, but will try to fill in some of the gaps.
This bee was very content on the one sunflower on my plot. The allotment has been taking a back seat for a bit with lots of other stuff happening, but I need to start to get on top of it again. There has been a steady harvest of courgettes and some other veg, but it is so dry with no rainfall for a long time.