Why are bed-mounted cup holders bad?

They concentrate weight on a small clamp, which can scratch the frame and rattle when you shift. They also put the cup at an angle that is right when you are lying down and wrong when you sit up to drink.

What is the best material for a bedside tray?

Heavy silicone or solid wood are both good. Silicone wipes cleaner and grips the nightstand. Wood looks better in most bedrooms. Either beats fabric, which absorbs spills.

Will there be a Bed Sidekick?

Eventually, yes. We are testing prototypes. Beds are harder than couches because the mattress itself is not a good cup surface. We will not ship one until it actually solves the problem.

The best cup holder for the bed (and why none of them are great)

Why bed cup holders are hard

A bed has none of the surfaces a cup needs. The mattress is soft. The frame is the wrong height. The nightstand, if there is one, is usually too far to reach without leaning. So most bed cup holders try to solve this with hardware that bolts to the frame, and most fail.

Hardware-mounted cup holders on beds have two problems: they rattle when you move at night, and they put the cup at the wrong angle relative to the mattress. The cup is fine until you sit up. Then it is in your way.

The four kinds of bed cup holder we tested

Bedside caddy with pockets. Cup falls deep into a fabric pocket. Cup is unreachable. Cup leaks into the pocket. Pocket grows mildew.
Frame-mounted plastic clip. Rattles. Scratches the frame. Looks like camping gear.
Mattress-tucking organizer. Slides out of position constantly. Adds bulk under the sheets.
Weighted tray meant for the bed itself. Tippy on a mattress. Better on a nightstand.

What actually works

After testing all four, the best answer for most people is a small, heavy, no-hardware tray that lives on the nightstand. The tray holds the cup and a small object or two, like a phone or a glasses case. When you want the cup on the bed, you move the tray over.

This is not elegant. It is the least-bad option. The reason no product is great for the bed is the bed itself is not a good surface for a cup. Accepting that and using the nightstand as the home base is more honest than buying another piece of bed hardware.

What to look for

Heavy base, not clip-on hardware.
Material that wipes clean. Silicone or solid wood beat fabric.
Wide enough to hold a real mug or tumbler, plus one small object.
Low profile. Anything taller than the nightstand is in the way.

A note on the Sidekick category

We are working on something for the bed. It is a couple of years away from being good enough to ship. The hard part is making one object that works as both a nightstand tray and a bed-side caddy. So far the prototypes are okay at both jobs and great at neither.

Until that ships, the nightstand-tray answer is the best one we have found. If you want a sofa version of the same idea, the Sofa Sidekick is what we made. Beds are harder.