The SL and awaking time ( AT ) in group C [ SL ( 401.08 + / - 16.54 ) min and AT ( 4.87 + / - 2.64 ) times ] were significantly superior to those in the other two groups [ SL ( 50.36 + / - 18.47 ) min , ( 54.87 + / - 20.92 ) min , AT ( 5.98 + / - 2.11 ) times , ( 6.13 + / - 3.04 ) times , all P < 0.05 ] .