Bipolar disorder and hypomania
A mood disorder defined by episodes: mania (bipolar I) or hypomania (bipolar II) lasting days to weeks, usually alternating with depressive episodes. Hypomania is a distinct, observable change from the person's usual self, with raised energy, reduced need for sleep, faster speech and thought, and riskier decisions, without the psychosis or hospitalisation of full mania.
What drives it
Biologically driven shifts in the brain's energy and reward systems, strongly heritable and often set off by sleep loss, travel across time zones, stimulants, antidepressants alone, or major life events. Hypomania feels good from inside, which is why it is rarely reported.
How it shows
Work
In hypomania: launching three projects in a week, emails at 3 a.m., talking over people, impatience with 'slow' colleagues, big unilateral decisions, overspending budgets, unusual charm and productivity that others first admire. Then a slump: missed deadlines, withdrawal, cancelled commitments. Colleagues describe 'two different people' at different times of year.
Relationships
Periods of irritability, sexual or financial impulsivity, grand plans announced without consultation, sleeping three or four hours and feeling fine. Partners notice the pattern before the person does, often by season. The depressive phases are heavy and frequently lead to a misdiagnosis of plain depression.
Self
You feel unusually sharp, confident and fast, need little sleep without feeling tired, and find other people sluggish. Later you look back at decisions, messages or spending from that week and do not quite recognise yourself.
What tells it apart
Hypomanic (manic) character: Hypomanic character is a stable, lifelong high-energy style with no clear episodes; bipolar hypomania is a time-limited change from baseline that people who know the person can date ('she was different from mid-March to early April'), and it is usually followed by a crash.
ADHD in adults: ADHD restlessness and impulsivity are constant from childhood and do not reduce the need for sleep; in hypomania the person sleeps far less without fatigue and the change comes in discrete episodes.
Major depression: The depressive episodes can look identical; the tell is a history of hypomanic periods, a family history of bipolar disorder, early onset, or becoming agitated and sleepless on antidepressants.
A test
Track mood, sleep and energy over months: an episodic pattern of reduced sleep without tiredness plus a clear change from baseline points to bipolar disorder and warrants psychiatric assessment, especially before anyone with recurrent depression starts antidepressants alone.
Questions to carry
- Across the months, when did sleep drop without tiredness, and how different was the person from their usual self then?
- During my best-feeling stretches, what did the people close to me notice that I didn't?
How strong the research is
strong
Where it comes from
Jean-Pierre Falret and Jules Baillarger, 1850s; Emil Kraepelin, 1899; Karl Leonhard separated bipolar from unipolar, 1957; bipolar II in DSM-IV, 1994