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2. Music and sleep - Wikipedia

   en.wikipedia.org/wiki/Music_and_sleep

   The decrease in systolic blood pressure, diastolic blood pressure, and heart rate signal a state of calmness, which is essential for having a good night sleep. Sedative music, which is characterized by a slow tempo, repetitive rhythm, gentle contours, and strings, is effective in generating anxiolytic responses to aid sleep.

3. Brainwave entrainment - Wikipedia

   en.wikipedia.org/wiki/Brainwave_entrainment

   Brainwave entrainment, also referred to as brainwave synchronization or neural entrainment, refers to the observation that brainwaves (large-scale electrical oscillations in the brain) will naturally synchronize to the rhythm of periodic external stimuli, such as flickering lights, [1] speech, [2] music, [3] or tactile stimuli.

4. Beat (acoustics) - Wikipedia

   en.wikipedia.org/wiki/Beat_(acoustics)

   Monaural beats are combined into one sound before they actually reach the human ear, as opposed to formulated in part by the brain itself, which occurs with a binaural beat. This means that monaural beats can be used effectively via either headphones or speakers. It also means that those without two ears can listen to and receive the benefits."

5. Management of heart failure - Wikipedia

   en.wikipedia.org/wiki/Management_of_heart_failure

   Sleep apnea is an under-recognized risk factor for heart failure. Uncontrolled sleep apnea may increase the risk of heart failure by up to 140%. [4] Weight reduction – through physical activity and dietary modification, as obesity is a risk factor for heart failure and left ventricular hypertrophy. Effective weight management has been shown ...

6. Sleep deprivation - Wikipedia

   en.wikipedia.org/wiki/Sleep_deprivation

   Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.

7. Pulsus alternans - Wikipedia

   en.wikipedia.org/wiki/Pulsus_alternans

   Pulsus alternans is a physical finding with arterial pulse waveform showing alternating strong and weak beats. [1] It is almost always indicative of left ventricular systolic impairment , and carries a poor prognosis.