Never mind oversleeping Renee, sleep is good and you have a lot to catch up on - not sure it helps with your morning work with Matteo and Alby though - were you late for the school run??
I would give Merlin another couple of days before moving him to the barn - mainly for your sake (you will worry too much!). But yes get his rugs off for a couple of spells during the day to give his skin a chance to breathe and him to have a scamper without them, especially as he cant go out in the bad weather. How much space can you give them down at the barn, can you have a bigger area for them in case the weather turns nasty again - not sure of what is available to you down there?