What is the foundational tool for great sleep at night?

The foundational tool for great sleep at night, according to Andrew Huberman, is getting morning sunlight. Viewing bright light early in the day is essential for setting your internal clock and promoting wakefulness throughout the day. This practice not only helps you feel more awake during the day but also significantly improves your ability to fall and stay asleep at night. This concept is well-supported by numerous peer-reviewed studies highlighting its significance in our physiology 1.