Insomnia is the lack of sleep, and insomiac is what the person who is suffering from the condition is called.
Insomnia
Insomnia. A person who suffers from sleeplessness is an insomniac.
insomnia
Aplasia is the medical term meaning absence of development.
Asplenia is the medical term meaning absence of the spleen.
Anhydrosis or anhidrosis, either spelling, is the medical term meaning an abnormal condition of an absence of sweat or perspiration.
Obstructive Sleep Apnea (OSA)
Athelia is the medical term meaning absence of nipples.
Aphakia is the medical term meaning absence of the lens. This is often a result of cataract surgery.
Aplasia is the medical term meaning absence of development.
Athelia means absence of a nipple.
arrhythmia
The medical term for absence of the external ear is "anotia." This condition involves complete absence of the external ear.
anhydrous
Anencephaly.