english: The rise in sleep-inducing chemicals, like adenosine and melatonin, send us into a light doze  that grows deeper, making our breathing  and heart rate slow down and our muscles relax.
non_english: Porast hemikalija koje pospešuju san, poput adenozina i melatonina, šalju nas u laku dremku koja postaje sve dublja, i zbog koje naše disanje i srčani ritam usporavaju a mišići nam se opuštaju.