A bed below a window should be reviewed for drafts, noise, light, condensation, window access, heating, and headboard stability.
Quick answer
The position is not automatically harmful; keep it when sleep is comfortable and the window remains safe, dry, and fully usable.
Inspect the window conditions
Check seals, street noise, early sun, dampness, and seasonal temperature. Repair moisture or building defects before adding heavy fabric.

Preserve access and egress
Do not block required escape, handles, vents, or radiators. Leave cleaning space and consider children or mobility needs.

Use practical small corrections
A secure headboard, suitable blind, curtain, or slight offset may improve comfort. Test the change over several nights.

Boundary: Feng shui is a cultural and design perspective. It cannot guarantee health, wealth, relationships, safety, or other outcomes. Use qualified professional advice for building, electrical, plumbing, fire-safety, accessibility, horticultural, or medical questions.