My 5 month old has just learnt to roll to his right. He has started practising in his sleep, which wakes him up a) as he rolls on to his tummy and gets stuck and b) - more alarmingly - he rolls with a dramatic flourish and if in the centre of the cot to start with, bangs his head quite heavily against the cot 
.
So far, I've put him right against the other side of the cot, as he can't roll that way yet and that gives him room to do his roll without injury.
But... at night it's very hard to put him down (he's asleep always before he goes into his cot but that's another issue...) as he'll roll straightaway and then cry. It can take several goes, and lots of removing myself limb by limb!
Then, he wakes up every 40-45 minutes overnight. He's not hungry except for a couple of times, he wakes up because he rolls (in his light sleep I think) which gives him a fright and wakes him up.
What can I do? He and I are both soooo tired! Luckily my DH has nearly finished for Christmas so can help in the night too but I'm a bit worried one night we'll fall asleep with him on the sofa while trying to settle him .
And today for the first time he rolled to the left - if I have to put him back in the middle of the cot to start with he'll hurt his head every time he rolls (it's a fair whack as it comes at the end of his roll when he's built up momentum).
Please tell me this is a phase!
Up until this point, he used to wake every 2-3 hours at night, which I could cope with, but I am just beyond exhausted with this - last night the room was spinning when I lay in bed (sadly not due to a night of festive cocktails as in the pre-baby days!). During the day he has about 4 catnaps of 45 minutes, so it's hard to catch up sleep then either.
I don't want to co-sleep as I'm a bit too worried about the SIDS risk. He's in a cot right next to my bed.
Thank you in advance!