Medusa, my cats have a couple of litter trays and have got used to being kept in at night. Jaywalker, I don't lock the cat flap until about 8pm. It is pitch dark by then and my cats are pretty happy sitting above the radiators!
Medusa, I agree with Jennys: the cat killer is still very active and your cats should really be kept in, however much they might dislike it. My cats get a few treats once they are safely locked 🔒 in.
lavender27, I feel like that a lot. I had an accident 18 months ago and am in constant pain. Some days, I can get myself from ED to Newbury, using a bus, a tube and two trains each way but, at other times, I can barely make it downstairs.