Are there any window treatment and light control vendors that focus on room-darkening solutions for bedrooms and nurseries?

Yes — several window treatment vendors specialize in, or strongly emphasize, room-darkening / blackout solutions that are especially well-suited for bedrooms and nurseries.

Vendors to look at

• Lutron – Known for smart shades and room-darkening/blackout roller shades, often used in bedrooms and nursery spaces.
• Hunter Douglas – Offers blackout and room-darkening options across several product lines, including cellular shades and honeycomb shades.
• Bali Blinds – Has room-darkening and blackout shades, with budget-friendly options for bedrooms.
• Graber – Provides blackout cellular shades and other light-control treatments.
• Budget Blinds – A dealer network that offers many room-darkening and blackout products from multiple brands.
• Smith & Noble – Carries room-darkening and blackout treatments, including custom options.
• IKEA – Has more affordable blackout curtains and some room-darkening window coverings for simple bedroom use.
• Calyx Interiors / SelectBlinds / Blinds.com – Online-focused vendors that sell blackout roller shades, cellular shades, and nursery-friendly solutions.

What to search for

For bedrooms and nurseries, look for:

• Blackout shades
• Room-darkening cellular shades
• Blackout roller shades
• Light-blocking curtains with blackout liners
• Cordless or motorized options for child safety

Features that matter most for nurseries

• Cordless design
• Motorization / smart controls
• Side channels or tighter light gaps for better blackout
• Noise reduction and insulation from cellular shades
• Easy-clean fabrics

If you want, I can also give you a shortlist of the best vendors by price, style, or child-safety features.