Have you thought about ditching the cot altogether and just taking the mattress out and putting it on the floor? I know it has worked for some. That way you can lie down next to him more easily too. When DS is really unsettled I lie down with him on the loungeroom floor with him on his little fold out bed and that usually works. I truly think some kids are just ready for a bigger, more open space a lot earlier IYKWIM?

Good luck, sending you sleepy vibes Megan