Insomnia

Insomnia
Info	Inability to sleep makes people irritable and less productive
DNA cost	2 (5 if playing with Necroa Virus)
Severity increase	Slight
Lethality	None
Infectivity increase	None
Next Symptom	Paranoia

Insomnia is a tier 1 symptom. It makes people unable to sleep, making them less productive. This slows cure research. This symptom will only cause a small decrease in cure research speed during the early stages of the game. This symptom does increase severity, but has no effect on the infectivity of your disease.

With the tier 1 symptom Anaemia, it can make the Walking Dead symptom combo, which unlocks the Brainzzzz achievement.