---
title: "What blood tests are worth checking for insomnia?"
type: symptom
url: "https://www.test-well.com/symptoms/insomnia"
symptom: Insomnia and poor sleep
aliases:
  - can't sleep
  - trouble sleeping blood test
  - waking at night
reviewed_at: 2026-09-06
review_status: reviewed
date_published: 2026-09-05
lab_fee_usd: 6
---

# What blood tests are worth checking for insomnia?

> Sleep problems have a few measurable contributors: a disrupted cortisol rhythm, thyroid dysfunction, low ferritin (linked to restless legs) and low magnesium. A focused set is morning and evening cortisol, TSH, ferritin and magnesium; the results either explain part of the problem or clear the way to sleep-focused evaluation.


## When should you see a clinician instead of ordering a test?

- Loud snoring with pauses in breathing or gasping — ask a clinician about a sleep study
- Insomnia with depressed mood, hopelessness or thoughts of self-harm — seek help now (988 in the US)

## Why these tests for insomnia and poor sleep?

Cortisol should be high in the morning and low at night; a flat or reversed pattern is associated with poor sleep and is checked with an a.m. and a p.m. draw. Hyperthyroidism causes difficulty falling and staying asleep. Low ferritin is a well-documented driver of restless legs, and magnesium supports muscle relaxation.

Sleep apnea, medications, caffeine, alcohol and mood disorders are the common non-lab causes; a sleep study, not a blood test, diagnoses apnea.

## Which conditions do these tests help evaluate?

- [Insomnia & Poor Sleep](https://www.test-well.com/conditions/insomnia) — Cortisol, thyroid, vitamin D and metabolic markers tied to disrupted sleep.
- [Thyroid Problems](https://www.test-well.com/conditions/thyroid-problems) — TSH, Free T4/T3 and antibodies to evaluate an under- or over-active thyroid.

## Which tests, and what do they cost?

| Test or panel | Type | Price | All-in (one item + $6 fee) | Fasting | Results |
| --- | --- | --- | --- | --- | --- |
| [Sleep Health Panel](https://www.test-well.com/tests/sleep-health-panel) | Panel (8 tests) | $129.99 | $135.99 | Yes | 3–5 business days |
| [Complete Thyroid Panel](https://www.test-well.com/tests/thyroid-complete-panel) | Panel (4 tests) | $109.99 | $115.99 | No | 3–7 business days |
| [Cortisol (AM)](https://www.test-well.com/tests/cortisol-am) | Test | $26.99 | $32.99 | No | 2–4 business days |
| [Cortisol, PM](https://www.test-well.com/tests/cortisol-pm) | Test | $34.99 | $40.99 | No | 1–3 business days |
| [TSH (Thyroid Stimulating Hormone)](https://www.test-well.com/tests/tsh) | Test | $26.99 | $32.99 | No | 1–3 business days |
| [Ferritin](https://www.test-well.com/tests/ferritin) | Test | $24.99 | $30.99 | No | 1–3 business days |
| [Magnesium](https://www.test-well.com/tests/magnesium) | Test | $19.99 | $25.99 | No | 2–4 business days |
| [Vitamin D, 25-Hydroxy](https://www.test-well.com/tests/vitamin-d) | Test | $41.99 | $47.99 | No | 1–3 business days |

Prices are cash-pay; every order adds one $6.00 lab processing fee. Physician authorization included.

## Common questions

### What time should I draw cortisol?

Morning cortisol between about 7 and 9 a.m., ideally within an hour of waking; evening cortisol in the late afternoon or early evening as the lab specifies. Note the times for your clinician.

## Related

- [What blood tests should you get for fatigue?](https://www.test-well.com/symptoms/fatigue)
- [Which blood tests help explain brain fog?](https://www.test-well.com/symptoms/brain-fog)
- [What blood tests should you get for hair loss?](https://www.test-well.com/symptoms/hair-loss)
- [What blood tests check for causes of unexplained weight gain?](https://www.test-well.com/symptoms/weight-gain)
- [All symptoms](https://www.test-well.com/symptoms)
- [Browse by condition](https://www.test-well.com/conditions)

---

Medically reviewed by Youmna DiStefano, MD (Medical Reviewer, TestWell); last reviewed 2026-09-06. Review policy: https://www.test-well.com/editorial-policy

Canonical page: https://www.test-well.com/symptoms/insomnia
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Prices are cash-pay, in USD, and include physician authorization; every order adds one flat $6 lab processing fee. Educational content is not a diagnosis — discuss results with a clinician.