Too much energy circulating around the lungs and heart leads to congestion and

stagnation. It causes insomnia.

Digestive system goes into overactive, causing rebellious energy to the heart. It causes insomnia.

Weak function of lung has trouble for circulating qi to the heart. If not, onset of heart palpitations, anxiety, and then awakened at night.

Coldness nature in S- causes nervousness and fearfulness, it causes lack of circulation, which can result in insomnia