Sleeping in = yes, doing much else = not so much...
The 'bag' itself is indeed lightweight and comfortable enough to sleep in ( if you only lay on your back ), but in terms of being able to walk around in it- no. It is tight around the shoulders ( I am 5'10" and ordered a size Large ), the legs are far too loose and the hood is also much too large even when the extremely long and unsecured draw-cords are pulled tight. Even when sitting down the bag feels tight as the fitment is very poor.
Over-all I'd say this is a good budget option compared to the more expensive Selk'bag for example, but you're not going to be wondering around or doing many tasks while wearing this and it will feel awkward the whole time regardless.