Another daft idea

Sleeping bags with sleeves, allowing for the following use cases:

1. Cuddling in tents. Because I'm soppy like that.
2. Sitting around in, say, a fscking cold flat in winter.
3. Camping in cold situations, where you want to do your sleeping bag all the way up but don't want to risk being unable to unzip yourself later.

The sleeves should terminate in mittens, for Safety. To support use case 2, the mittens should perhaps be the type where the end can be folded back to reveal the wearer's fingers.

There's prior art: several brands of blankets-with-sleeves are commercially available.