Infants (0-3 months): 14-17 hours per day. Infants (4-12 months): 12-16 hours per day. Toddlers (1-2 years): 11-14 hours per day, including naps. Preschoolers (3-5 years): 10-13 hours per day, including naps. School-age children (6-12 years): 9-12 hours per day. Teenagers (13-18 years): 8-10 hours per day. Adults generally need 7-9 hours of sleep per night, while older adults (grandparents) may need 7-8 hours. Oversleeping, or sleeping excessively, can lead to a range of negative health consequences. While the exact effects can vary depending on individual factors and the duration of the oversleeping, potential issues include weight gain, increased risk of diabetes and heart disease, cognitive decline,