What are reasons why your eyes become bloodshot when you have a lack of sleep?

Dryness/friction. Lack of adequate tear production, dryness and friction cause blood vessel irritation and increased redness use of excessive caffeine to stay awake aggravates this dryness.

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Why do eyes get bloodshot from lack of sleep?

Dark circles. Lack of sleep causes fatigue which causes paleness of the skin, allowing the blood underneath the skin to become more visible & appear darker. Read more...