Upgrade the bed: spend coins to raise income per second
5 min read
ResourcesUpgradeBed
Tap the bed for the next output, coin cost, and door requirement. Door high enough and still stable? Then raise the bed.

Tap the bed to see next-tier coins per second, the coin price, and what door level it wants. The screenshot's Shabby Cot is 4 Gold Coins/s, 50 coins, Iron Door LV2. Numbers can change; follow your game.
Door too low? Raise the door first. Don't invent a full upgrade table from one screenshot. Open it and read this tier.