How does a 7-Night Sleep Lab experiment work?

You isolate a single sleep variable (such as phone use before bed, late caffeine cutoff, or consistent bedtime) for 7 consecutive days. Nini tracks your morning restedness and sleep latency check-ins to measure the exact percentage impact on your sleep quality.

How is the Nini Sleep Score calculated?

The Sleep Score (0–100) is calculated based on total sleep duration, estimated sleep cycles completed (90 min increments), sleep latency (time to fall asleep), and morning subjective alertness check-ins.

Sleep Science:

📝 Sleep Intake & Plan 🧪 Sleep Lab & Habits 🦁 Chronotype Quiz 📓 Dream Journal 🏆 Badges & Streaks

Circadian Science

Nini Sleep Lab

Change one habit for seven nights. Nini compares your own check-ins—never other people’s data—to reveal what truly helps your biology.

🧪

7-Night Habit Trial

Personal Sleep Experiments

Select an Experiment to Run:

☕

Caffeine cutoff

Avoid caffeinated drinks after 2:00 PM. Keep everything else as normal as practical.

📱

Screen curfew

Put bright, interactive screens away 30 minutes before your planned bedtime.

⏰

Bedtime consistency

Go to bed within 20 minutes of your planned bedtime each night.

🫁

Slow breathing

Complete four minutes of slow, comfortable 4-7-8 breathing before getting into bed.

❄️

Cooler bedroom

Make the room comfortably cool (~18°C/65°F) before bed without sacrificing comfort.

🧘

Evening meditation

Complete one 5–10 minute meditation during your wind-down routine.

NIGHT 4 OF 7 3/7 Completed

Keep your caffeine cutoff

Avoid caffeinated drinks after 2:00 PM. Keep everything else as normal as practical.

Offline Scoring Algorithm

Sleep Score Calculator (0–100)

Computed offline from 4 parameters: Sleep Duration (40 pts), Bedtime Timing (20 pts), Restfulness (25 pts), and Pre-Sleep Factors (15 pts).

1. Sleep Duration: 8.0 hours

2. Bedtime Timing: 10:30 PM (Ideal)

3. Restfulness: 5 / 5 Stars

4. Pre-Sleep Factors (Tap to toggle):

COMPUTED SLEEP SCORE

Optimal Rest

Duration: 40/40 • Timing: 20/20 • Quality: 25/25 • Habit Cleanliness: 9/15

I need to wake up at:

OPTIMAL TIMES TO FALL ASLEEP (INCLUDES 15 MIN WIND-DOWN)

💡 Ultradian Science: 5 full 90-minute cycles (7.5 hours) or 6 cycles (9 hours) prevents waking in the middle of Deep Delta sleep.