Product Designer

Lull

Lull is an iOS app that turns sleep data into small, doable habits. Most sleep apps stop at a score; I wanted to connect that score to the habits that actually move it. The evening is dark and quiet, the morning bright and short.

The Lull app shown on a phone, with the sleep score and the night detail screen

Overview

Every insight ends with an action. Night screens use a dark gradient while morning screens stay light. Times and numbers are set in a monospaced typeface so the data lines up, and mint, the single accent, marks progress.

Screens

Onboarding

Wake time first, then the sleep goal. The app proposes the bedtime.

The Lull onboarding screen asking for a wake time and a sleep goal

Today

Last night's score up top, today's habits right below. The insight card connects the two.

The Lull today screen with the sleep score above the day’s habits

Night Detail

A readable hypnogram, heart rate through the night and tags that explain how the night went.

The Lull night detail screen with a hypnogram and heart rate through the night

Weekly Trends

Seven bars against the goal line, with bedtime consistency and sleep debt at a glance.

The Lull weekly trends screen with seven bars against a goal line

Monthly View

A heat map calendar, the best and roughest nights, and the score trend across months.

The Lull monthly view with a heat map calendar of sleep scores

Habits

Each habit shows its streak and the last seven days. Categories filter by time of day.

The Lull habits screen with streaks and the last seven days per habit

Habit Detail

The habit's effect on the sleep score in real numbers, with a completion calendar and reminders.

The Lull habit detail screen showing a habit’s effect on the sleep score

Wind-down Routine

A countdown to bedtime and a step by step routine, with one step active at a time.

The Lull wind-down routine with a countdown to bedtime

Smart Alarm

A wake window instead of a fixed time. Sound, sunrise light and vibration sit as simple rows.

The Lull smart alarm screen with a wake window instead of a fixed time

Insights

Which habits move the score and by how much, plus a bedtime sweet spot. Every card ends with a suggestion.

The Lull insights screen showing which habits move the sleep score

Devices and Sync

Watch connection, data sources as toggles and one sentence on where health data lives.

The Lull devices screen with watch connection and data source toggles

Profile and Settings

Sleep goal, reminders, devices and account in grouped lists. Nothing is more than one tap deep.

The Lull profile and settings screen with grouped lists

Outcome

The hardest part of this project was making the data meaningful without making it intimidating. I tried to simplify charts like the hypnogram and the impact bars while never hiding the numbers behind them.