I don't sleep well either in this weather, I am a bit unwell on my meds which don't help. But I hate this weather. The thing is in the day the humidity shoots right down so although its warmer its easier to relax as it were. And at night in my area it was well over 90% and I am sure its like that across the rest of the UK.
And we were supposed to get storms last night. It seems everywhere did BUT us. Just outside of London and they got them but we didn't so the air hasn't cleared
Hope your more comfy tonight.