Adults aged 18 to 64 need 7 to 9 hours of sleep a night and adults aged 65 and older need 7 to 8 hours a night.1
1. Hirshkowitz M, Whiton K, Albert SM, Alessi C, Bruni O, DonCarlos L, Hazen N, Herman J, Hillard PJ, Katz ES, Kheirandish-Gozal L, Neubauer DN, O’Donnell AE, Ohayon M, Peever J, Rawding R, Sachdeva RC, Setters B, Ware JC. National Sleep Foundation’s updated sleep duration recommendations: final report. Sleep Health [Internet]. 2015 Dec [cited 2019 Apr 17];1(4):233–43. Available from: https://www.sciencedirect.com/science/article/abs/pii/S2352721815001606?...