Sleep may be needed.Logical formLearned from46 sentences. Sleep may elude a person.Logical formLearned from46 sentences. Sleep can be serious.Logical formLearned from46 sentences. Sleep can be reduced.Logical formLearned from46 sentences. A person may use sleep.Logical formLearned from46 sentences. Sleep may happen.Logical formLearned from45 sentences. (Sleep patterns) can be disturbed.Logical formLearned from45 sentences. A stage can be constituted-of-or-filled-with sleep.Logical formLearned from45 sentences. A person may fall into sleep.Logical formLearned from45 sentences. Sleep can be happy.Logical formLearned from45 sentences. Some stages can be constituted-of-or-filled-with sleep.Logical formLearned from44 sentences. (Sleep apnea) can be a condition.Logical formLearned from44 sentences. A person may suffer from (sleep apnea).Logical formLearned from44 sentences. (Sleep cycles) may pertain-to a person.Logical formLearned from44 sentences. Sleep can be dark.Logical formLearned from44 sentences.