J - whats your bedtime routine? If you aren't already, try to implement a bath, book, bedtime routine, seriously it works a treat and then Jamie will know whats coming

Perhaps he's ready for a bed? If he's climbing out of the cot (as well as the danger if he falls) he might just be anti cot now - maybe even try the cot mattress on the floor, and make the bed an exciting place to be - some nice kids sheets and a special pillow or something perhaps?