The most suitable direction for a house to sleep in is generally the north-south orientation. This orientation allows for optimal sunlight exposure and temperature regulation throughout the day. Studies have shown that sleeping in a north-south aligned room can lead to better sleep quality and overall well-being. According to a study published in the Journal of Building Performance Simulation, rooms aligned in this direction experience less heat gain during the summer and more consistent temperatures throughout the year, which can contribute to a more comfortable sleeping environment. Additionally, the north-south alignment minimizes the impact of solar glare and heat gain, reducing the need for excessive air conditioning and promoting energy efficiency.