Insomnia can count as a disability in the US, but it depends on which law you mean. Under the Americans with Disabilities Act (ADA), sleeping is a named major life activity, so insomnia that substantially limits it may qualify you for reasonable accommodations at work. Social Security disability benefits are a much higher bar, and insomnia alone rarely meets it. This is general information, not legal advice.
The ADA: accommodations at work
The ADA protects people with a disability from discrimination at work and requires employers with 15 or more employees to provide reasonable accommodations. A disability, for ADA purposes, is a physical or mental impairment that substantially limits one or more major life activities.
The ADA Amendments Act of 2008 made two changes that matter here. It listed "sleeping" by name as a major life activity, alongside things like concentrating and thinking. And it told courts to read "substantially limits" broadly rather than demanding near-total incapacity. A condition that comes and goes can also count if it substantially limits you when it is active.
So chronic insomnia can qualify. Whether yours does is decided case by case, based on how much it limits you, not on the label. Accommodations people ask for include a later or more consistent start time, moving off rotating or night shifts, flexible breaks, or remote work on some days. The employer does not have to accept a request that would cause undue hardship, and may offer an alternative.
Social Security: a much higher bar
Social Security Disability Insurance (SSDI) and Supplemental Security Income (SSI) pay benefits when a condition stops you from doing any substantial work for at least a year. That is a different question from the ADA's, and a far harder one.
The Social Security Administration keeps a list of impairments, often called the Blue Book. Insomnia is not on it. That does not make a claim impossible, but it means you cannot point to a listing and match the criteria. Instead, claims that involve insomnia usually succeed because of something else: an underlying or co-occurring condition such as depression, an anxiety disorder, PTSD or chronic pain, together with strong evidence of how the combination limits what you can do day to day.
The deciding factor is documented functional limitation: what you can no longer do reliably, how often, and what treatment has been tried.
ADA vs Social Security at a glance
| ADA | Social Security (SSDI/SSI) | |
|---|---|---|
| What you get | Reasonable changes at work and protection from discrimination | Monthly income when you cannot work |
| Is sleeping named? | Yes, as a major life activity | Insomnia is not a listed impairment |
| The test | Substantially limits a major life activity | Prevents substantial work for 12 months or more |
| Insomnia alone | Can qualify, case by case | Rarely enough |
| Who decides | Your employer first; the EEOC or courts if disputed | The Social Security Administration |