Sometimes bed is the only place you can tolerate being, and a small amount of work still feels necessary or meaningful. A supported setup may make that choice easier, but working from bed is still work. It does not provide the same rest as putting the task down.
Keep the arrangement simple
Use a stable surface designed to hold the device safely, with ventilation unobstructed. Position the screen so you are not straining to see it, and support your arms where comfortable. Keep chargers, drinks, and cables arranged to reduce spills, overheating, and tangles.
If raising the screen makes typing awkward, a separate keyboard may help. Avoid balancing a heavy device where it could fall onto you. Ask for assistance moving equipment if lifting or reaching worsens symptoms.
Give the task an endpoint
Choose one defined piece of work, such as reviewing a short document, rather than opening the whole day’s inbox. Leave room to stop sooner. Cognitive effort can be demanding even when you are lying down, especially if you experience post-exertional symptom worsening.
If symptoms are severe, sick leave or a change in expectations may be more appropriate than a better tray. Discuss recurring needs with your employer or care team. You do not owe productivity from every resting place. The setup is an option for your use, not a standard you must meet when you are unwell.