(a) General. Where an employee is required to be on duty for 24 hours or more, the employer and the employee may agree to exclude bona fide meal periods and a bona fide regularly scheduled sleeping period of not more than 8 hours from hours worked, provided adequate sleeping facilities are furnished by the employer and the employee can usually enjoy an uninterrupted night's sleep. If sleeping period is of more than 8 hours, only 8 hours will be credited. Where no expressed or implied agreement to the contrary is present, the 8 hours of sleeping time and lunch periods constitute hours worked. (Armour v. Wantock, 323 U.S. 126 (1944); Skidmore v. Swift, 323 U.S. 134 (1944); General Electric Co. v. Porter, 208 F. 2d 805 (C.A. 9, 1953), cert. denied, 347 U.S. 951, 975 (1954); Bowers v. Remington Rand, 64 F. Supp. 620 (S.D. Ill, 1946), aff'd 159 F. 2d 114 (C.A. 7, 1946) cert. denied 330 U.S. 843 (1947); Bell v. Porter, 159 F. 2d 117 (C.A. 7, 1946) cert. denied 330 U.S. 813 (1947); Bridgeman v. Ford, Bacon & Davis, 161 F. 2d 962 (C.A. 8, 1947); Rokey v. Day & Zimmerman, 157 F. 2d 736 (C.A. 8, 1946); McLaughlin v. Todd & Brown, Inc., 7 W.H. Cases 1014; 15 Labor Cases para. 64,606 (N.D. Ind. 1948); Campbell v. Jones & Laughlin, 70 F. Supp. 996 (W.D. Pa. 1947).)

(b) Interruptions of sleep. If the sleeping period is interrupted by a call to duty, the interruption must be counted as hours worked. If the period is interrupted to such an extent that the employee cannot get a reasonable night's sleep, the entire period must be counted. For enforcement purposes, the Divisons have adopted the rule that if the employee cannot get at least 5 hours' sleep during the scheduled period the entire time is working time. (See Eustice v. Federal Cartridge Corp., 66 F. Supp. 55 (D. Minn. 1946).)