Frequently Asked Questions

Slumber Drift is a HealthKit-powered idle exploration game. Your sleep quality each night determines how far your airship can travel the next day. Better sleep means stronger stats, better weather, and farther destinations. It's designed for ~2 minutes of active play per day.

No. The game works with iPhone-only sleep data. However, Apple Watch provides detailed sleep stages (Deep, REM, Core), which unlock the full potential of the Focus and Creativity stats. Without a Watch, these stats use estimated values (capped at 0.9 instead of 1.5) and show an "est." badge.

The game still works. All stats default to 1.0 (neutral), and you can explore normally. A banner on the Briefing screen lets you connect HealthKit later through Settings if you change your mind.

During onboarding, you set a sleep goal (6h to 9h30m in 15-minute steps) and a wake time. These can be changed anytime in Settings, accessible from the gear icon on the Briefing screen.

It depends on the island's distance and your Speed stat. Tier 1 islands take 1–4 hours, Tier 2 takes 3–9 hours, and Tier 4 can take up to 15 hours. The formula is: distance × 1.5 × max(0.5, 1.5 − speed). You can close the app and come back later.

• Stamina — Total sleep vs your goal. Affects resource yield.
• Focus — Deep Sleep %. Affects mining quality.
• Creativity — REM Sleep %. Affects discovery chance.
• Speed — Sleep efficiency. Determines max travel distance.
• Luck — Bedtime regularity over 7 days. Affects rare encounters and weather.

Golden Wind is the rarest weather condition, triggered when Luck > 0.9 and Stamina ≥ 1.0. It doubles all stats for that day's exploration. It can only occur once per week, making consistent good sleep the key to achieving it.

Yes. Tap "Recall Airship Early" on the Exploration screen. A confirmation dialog warns that you'll receive only 50% of resources gathered so far. Useful when you want to upgrade quickly.

There's no fixed endpoint. Discovering all 12 islands takes roughly 40–60 days. Completing all upgrades takes 60–90 days. Collecting all 88 constellations and maxing NPC relationships can take 3–6 months of daily play. It's designed as a long-term companion, not a sprint.

The Sky Map contains 88 constellations across 4 rarity tiers (Common, Rare, Epic, Legendary). Each has unique unlock conditions tied to your sleep patterns, weather, streaks, and exploration milestones. They're rendered in real-time with SwiftUI Canvas — no image assets required.

Yes. The core loop — sleep tracking, Tier 1–2 islands, basic upgrades, NPC dialogue, and 7-day exploration log — is completely free with no ads and no time limits.

Full Adventure ($4.99, one-time) unlocks Tier 3–4 islands, Lv 3–4 upgrades, NPC quests, unlimited exploration log, sleep analytics, and CSV data export. No subscriptions.

An optional way to support development. Three tiers: $0.99, $2.99, and $4.99. No features are attached — it's purely a thank you. Tips are never prompted more than once per week.

Sleep analysis data only: total sleep duration, sleep stages (Deep, REM, Core), bedtime, wake time, and sleep efficiency. The app reads — it never writes. No heart rate, no steps, no workouts.

No. The app has no server, no analytics, no tracking, and no third-party SDKs. All data stays on your device. Deleting the app removes everything permanently.

Full Adventure users can export their entire exploration history as a CSV file from the Journal tab. The export includes dates, stats, weather, islands visited, and resources gathered.

iOS 18.0 or later. iPhone only (portrait orientation). iPad is not supported.

Yes. Slumber Drift is fully offline. There are no accounts, no cloud sync, and no network requirements. Everything runs on your device.

Go to Settings (gear icon on the Briefing screen) and tap "Restore Purchases". You can also restore from the paywall screen. Purchases are tied to your Apple ID and can be restored on any device.