Jirafa — 2 soat,ot — 3 soat, maymun — 9 soat, delfin — 10 soat, it — 10 soat, mushuk — 12 soat, sichqon — 13 soat, olmaxon — 14 soat uxlaydi.
Inson miyasida taxminan yuz milliard hujayra bor.35 yoshdan hujayralar soni kamaya boshlaydi.Bu kamayish yiliga 2,5 millionni tashkil etadi.