Sleeping in a room immediately after spraying an insecticide or bug spray is not recommended, as the chemicals in the spray can be harmful if inhaled or absorbed through the skin. The time required to wait before re-entering the room will depend on the specific product used, the room size, and the ventilation available. In most cases, waiting at least two to four hours after spraying is recommended before re-entering the room. It is important to read the insecticide or bug spray label carefully for specific instructions and safety precautions. The label will usually provide information on how long to wait before re-entering the treated area and other safety considerations. Suppose you need more clarification about the safety of re-entering a room after spraying. In that case, consulting a licensed pest control professional or the product manufacturer for guidance is best.