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The typical pattern of an infantile spasm occurs soon after arousal from sleep, and involves a sudden bending forward and stiffening of the body, arms, and legs
In the sentence you want to sleep when you are tired the words to sleep are an irregular verb. Verbs who do not follow the typical pattern for conjugation are called irregular verbs.
Stage 1 Sleep
eat, sleep, get drunk. meats such as pork with apple sauce and pasta from Italy has a big influence on their eating. habits.
Stage 1 sleep
emperor scorpion's sleep pattern is if prey goes by it, kills it.
sex with a girl and sleep after
well the live in the wild for about 50 years are more
Eat, sleep and survive as does most other animals.