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2. Exploding head syndrome - Wikipedia

   en.wikipedia.org/wiki/Exploding_head_syndrome

   Frequency. ~10% of people [2] Exploding head syndrome (EHS) is an abnormal sensory perception during sleep in which a person experiences auditory hallucinations that are loud and of short duration when falling asleep or waking up. [2][4] The noise may be frightening, typically occurs only occasionally, and is not a serious health concern. [2 ...

3. Cortisol awakening response - Wikipedia

   en.wikipedia.org/wiki/Cortisol_awakening_response

   The cortisol awakening response (CAR) is an increase between 38% and 75% in cortisol levels peaking 30–45 minutes after awakening in the morning in some people. [1] This rise is superimposed upon the late-night rise in cortisol which occurs before awakening. While its purpose is uncertain, it may be linked to the hippocampus ' preparation of ...

4. Migraine - Wikipedia

   en.wikipedia.org/wiki/Migraine

   The aura, which immediately precedes the headache. The pain phase, also known as headache phase. The postdrome, the effects experienced following the end of a migraine attack. Migraine is associated with major depression, bipolar disorder, anxiety disorders, and obsessive–compulsive disorder.

5. Why Am I Waking Up with Headaches? A Sleep Expert Helps Us ...

   www.aol.com/lifestyle/why-am-waking-headaches...

   For premium support please call: 800-290-4726 more ways to reach us

6. Reflex syncope - Wikipedia

   en.wikipedia.org/wiki/Reflex_syncope

   Reflex syncope. Reflex syncope is a brief loss of consciousness due to a neurologically induced drop in blood pressure and/or a decrease in heart rate. [5][6][7][8][9][10][2] Before an affected person passes out, there may be sweating, a decreased ability to see, or ringing in the ears. [1] Occasionally, the person may twitch while unconscious. [1]

7. Sleep paralysis - Wikipedia

   en.wikipedia.org/wiki/Sleep_paralysis

   Sleep paralysis is a state, during waking up or falling asleep, in which a person is conscious but in a complete state of full-body paralysis. [ 1 ][ 2 ] During an episode, the person may hallucinate (hear, feel, or see things that are not there), which often results in fear. [ 1 ][ 3 ] Episodes generally last no more than a few minutes. [ 2 ]

8. Postural orthostatic tachycardia syndrome - Wikipedia

   en.wikipedia.org/wiki/Postural_orthostatic...

   Postural orthostatic tachycardia syndrome (POTS) is a condition characterized by an abnormally large increase in heart rate upon sitting up or standing. [1] POTS is a disorder of the autonomic nervous system that can lead to a variety of symptoms, [10] including lightheadedness, brain fog, blurred vision, weakness, fatigue, headaches, heart palpitations, exercise intolerance, nausea ...

9. Hypnic jerk - Wikipedia

   en.wikipedia.org/wiki/Hypnic_jerk

   A hypnic jerk, hypnagogic jerk, sleep start, sleep twitch, myoclonic jerk, or night start is a brief and sudden involuntary contraction of the muscles of the body which occurs when a person is beginning to fall asleep, often causing the person to jump and awaken suddenly for a moment. Hypnic jerks are one form of involuntary muscle twitches ...