Loomis provided the earliest detailed description of various stages of sleep in the mid-1930s, and in the early 1950s, Aserinsky and Kleitman identified rapid eye movement (REM) sleep. Sleep is generally divided into 2 broad types: nonrapid eye movement (NREM) sleep and REM sleep. Based on EEG changes, NREM is divided further into 4 stages (stage I, stage II, stage III, stage IV). NREM and REM occur in alternating cycles, each lasting approximately 90-100 minutes, with a total of 4-6 cycles.
Lizards can be ready to mate when they are a year old for most of the small and medium species. For the larger ones it may be two or three years of age. There are a few species of Lizards that take part in asexual reproduction.This means that they donât need to find a mate in order for them to be able to produce offspring. They have the ability to create the young on their own.or the larger ones it may be two or three years of age. There are a few species of Lizards that take part in asexual reproduction. This means that they donât need to find a mate in order for them to be able to produce offspring.
When the male lizard is close enough to the female lizard he will then take hold of her by biting her on the neck. He will then be able to hook onto her with his hemipenes. These are like hooks that connect to the female. After this he will ejaculate his sperm through his penis and hemipenes and into the female lizard.ut the females of some species give birth to live young. Among lizards that do lay eggs, most eggs require several weeks or even a few months to hatch. The eggs of a panther chameleon may need 240 or more days to develop before hatching. Source(s): I want to be genetic engineer and watch a lot of science shows.