The evidence on the Oxford English Corpus shows that people often mistakenly use lay when they should be using lie : X I want to lay down, itâll be more comfortable. â I want to lie downâ¦. [infinitive of lie (1)]. X The tortoise lays on its back, its belly baking in the hot sun.
View full size image. The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction, sleep, and mood, among other things.
1 Hormones produced: Releasing hormones for the pituitary gland.  Function: Stimulates or suppresses the release of hormones in the pituitary gland to control water balance, sleep, temperature, appetite and blood pressure. Serves as the primary link between the endocrine and nervous systems.