The 90-Minute Wind-Down: An Evening Routine That Works

Most "evening routine" advice is either too vague ("relax before bed") or too rigid ("do exactly these 12 steps"). Here's a practical framework based on what the research actually shows matters.

The core idea: your body needs about 90 minutes to transition from wakefulness to sleep-ready. If you're going from full alertness to "lights out" in 5 minutes, you're skipping the biological on-ramp.

T-minus 90 Minutes: Change the Light

This is the single most impactful step. At 90 minutes before your target bedtime, your light environment should shift.

• If you have circadian bulbs: They should already be in evening/ZeroBlue mode. Nothing to do. This is why automated circadian lighting is the cheat code — it handles this without you thinking about it.
• If you don't: Turn off overhead lights. Switch to dim, low-positioned lamps. Avoid the bathroom (the brightest room in most homes) unless necessary.

The goal: remove blue wavelengths from your environment so melatonin production can begin. This is not about dimness — it's about spectral content. A bright amber light is better than a dim blue-white one.

T-minus 60 Minutes: Drop Your Core Temperature

A hot bath or shower 60–90 minutes before bed is one of the most well-supported sleep interventions in the literature. A meta-analysis in Sleep Medicine Reviews found it can reduce sleep onset latency by an average of 10 minutes.

The mechanism is counterintuitive: warming your skin dilates peripheral blood vessels, which accelerates core body temperature drop after you get out. That temperature drop is a key signal for sleep initiation.

• Water temperature: warm to hot (104–108°F / 40–42°C)
• Duration: 10+ minutes
• Timing: 60–90 minutes before bed (not right before — you need time for the cool-down)

T-minus 45 Minutes: Screen Cutoff (or Not)

The standard advice is "no screens before bed." The nuanced truth: it depends on what's on the screen and what light is above your head.

Reading a Kindle or watching a calm show on a phone with Night Shift — while your overhead light is blue-free — is probably fine. The phone delivers 30–50 lux; your ceiling delivers 200–500. If you've fixed the ceiling, the phone is a rounding error.

What actually matters:

• Avoid stimulating content — work email, news, social media, intense shows. The cognitive activation matters more than the blue light.
• Avoid bright screens at full brightness — dim them and use warm/night mode
• Don't scroll in bed — bed is for sleep (and sex). Train the association.

T-minus 30 Minutes: Cool the Room

Set your bedroom to 65–68°F (18–20°C). If you don't have a programmable thermostat, open a window or turn on a fan 30 minutes before bed to pre-cool the room.

T-minus 0: Lights Out

The room should be as dark as possible. Blackout curtains or an eye mask. Cover any standby LEDs (use electrical tape).

If you have circadian bulbs, they should be in their deepest warm mode (1400K or similar) for the last 30 minutes, then you simply turn them off.

The Cheat Sheet

• 90 min before bed: Blue-free lighting (automatic with circadian bulbs)
• 60 min before bed: Hot shower or bath
• 45 min before bed: Screens down or at minimum brightness, calm content only
• 30 min before bed: Cool the room to 65–68°F
• Bed: Dark room, consistent time, same wake time tomorrow