There is an even more comfortable way of playing in bed (requires a wall to your right or left). It’s borderline decadent: Use a wall-mounted arm for a monitor, combine it with a VESA tablet mount, insert either a tablet or a small portable display and then connect whatever you want to this display. You can quickly swing the thing to face you - and once you’re done for the evening, just push it flush against the wall.

I’m primarily using this for reading ebooks on a tablet (using a Bluetooth mouse for scrolling) and watching the occasional episode of a TV show in bed, but it also works very well for gaming. I’ve used it with all sorts of other devices, including consoles, a small PC and the old hardware Steam streaming thingy. You can of course connect a Steam Deck to this screen as well, although keep in mind that most portable displays are 1080p and the Deck is optimized for 1280x800. Especially for longer play sessions, this is less straining due to the larger display and the lower weight of a controller vs. the Deck.

If you don’t need the ability to mount a tablet, you can of course just attach a regular monitor to this thing.