We all get over protective and worried about our bubs I think.
I remember doing the 'are they still breathing?' check all the time HEHE
Its a mum thing

If he is growing big so fast, sounds like you have a healthy boy there, who is getting he well needed (restless) sleep. Wait till he figures out rolling and giving you more to worry about when sleeping in his cot.....the joys of motherhood.

Congratulations, sounds like you are a very loving and caring mummy