Me too. Every single time I wake up from a lucid dream I’m sweating a lot more than what is normal to me, and I feel very warm.
Also, as far as I can remember I wake up on my back after most of my LDs.
I find 15c a comfortable room temperature for sleeping…
Well Metal Head thats relative because with heat u sleep less deep so that also will influence your dreams, so also lucidity 
But its true in cold your melatonin productions is at its highest.
Jeff
turns on the air
night time 
Also, does time of day affect it? For instance, when I go to bed around 1 or 2 AM, I have MUCH more vivid dreams than when I go to bed at a more ‘reasonable’ hour, like 11PM. Any thoughts?
I usually remember more dreams if it’s cold since i keep waking up all the time.
Yes Epik it does! Strongly even because we have a biorythm based on melatonin. The melatonin production is not the same all fo the day.
Jeff
I’ve experimented with both the amount of light and temperature.
I’ve found with no light(zero, no alarm clock, no door crack, nothing) sleep became very deep and dream recall was drastically reduced.
When the temperature was hot 24-26C once again sleep was deep and dream recall was reduced.
When the temperature was 20-22C dream recall was excellent and the tendancy to wake up more during the night washroom breaks and to record dreams was increased.
I’ve been monitoring these two factores since I began my LD research and I believe they play an important role. The actual temperature or amount of light is not important but finding the “sweet” spot is. Hence recording temperature and light quantity in your dream journal could help you find the “Sweet” spot and clues to a reliable technique.