I Asked 3 Designers What's The Worst Color to Paint a Bedroom, and They All Said the Same Thing
Briefly

Bedrooms serve as private retreats intended for unwinding and personal comfort. Essential bedroom furniture includes a dresser, a nightstand (even a small one), and a bed frame. Wall color should help conjure a serene oasis, with blues, greens, and neutrals as classic choices. Red is highly stimulating and associated with energy and alertness. Red can feel aggressive or overwhelming in large doses and can disrupt sleep patterns by increasing heart rate and blood pressure. Associations of red with passion, danger, and aggression make it counterproductive for promoting restful, restorative sleep.
[It's] highly stimulating and associated with energy and alertness,
This room is meant for winding down, so red can also feel aggressive or overwhelming in a large dose.
Red can disrupt your sleep patterns [and] increase your heart rate and blood pressure, which is the opposite of a restful restorative sleep experience,
Read at Apartment Therapy
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