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Sleep is the most important factor in the body's recovery after exercise. Several important growth factors are regulated and produced during sleep. These factors, sleep hormone and cortisol, are regulated during sleep, providing excellent opportunities for muscle growth and adaptation to training. 5-HTP not only improves sleep but also shortens the time to deep sleep. You will sleep deeper without waking up in the middle of the night. You can buy supplements to improve sleep in the sports nutrition store 5lb.ua