We have a pretty good routine for daytime naps. He mostly naps in the sling during the day but in preparation for starting at cm I started giving him naps in the pram. It worked really well and he settled easily at the same time for same length. (He will self-settle in cot for daytime naps but they don't last long 30 mins average whereas in the sling and pram he can do 1.5 hr)
However the last few weeks he's stopped sleeping in the pram. He starts dropping off, his eyes shut then suddenly he'll open them and jerk himself awake trying to sit up. Nothing has changed with the pram. I've tried different angles, draping a muslin over the hood, walking in quiet places etc. he'll sometimes eventually drop off out of exhaustion but this morning it was over an hour after he'd normally sleep and I was walking round all that time and eventually had to hold his hands down. It's as if he's deliberately waking himself up as soon as he starts falling asleep!
I've tried similar but it doesn't seem to work and up until about 2-3 weeks ago he slept fine. He still sleeps in the sling fine in daylight.
If he can't see he gets frustrated and tries to get out as he can hear and wants to see. It's just weird that it started so suddenly. Literally overnight he went from falling asleep easily in the pram to fighting every nap!