VOA慢速英语:不良的睡眠行为与许多健康问题有关

metabolic – adj. related to the chemical processes by which a plant or an animal uses food or water to grow, heal and make energy

obesity – n. the state of being very fat in a way that is unhealthy

inconsistent – adj. not continuing to happen or develop in the same way

associate – v. to connect someone or something with something else

cycle – n. a set of events or actions that happen again and again in the same order

rhythm – n. a regular, repeated pattern of events, changes or activities

synchronize – v. to happen at the same time or speed