I couldn’t wear one of those garments as I would have to keep taking them off to go to the loo Precisely why I don't wear them NanKate! I have, instead, a couple of pairs of what I call my "twosies"
- cosy fleece PJs. Couldn't possibly wear them in bed, or indeed any kind of pyjamas.
I've bought pyjamas a number of times, thinking they'd be just the thing on a cold night, but it's no good, I simply cannot bear the feel of sleeves or trouser legs in bed! So it's a short sleeved cotton jersey nightie for me, no matter how cold it is. And a cosy hot water bottle 
I always get dressed as soon as I'm up in the morning, and I'm in my 'twosies' after a shower in the evening. The only other time I lounge around in them is if I'm feeling unwell.