Recommended Sleep Instruments and Bedroom Fixes

The Better Sleep Environment Workbook starts with the free fixes, and most bedrooms improve without buying anything. These are the instruments that let you measure the room and the fixes the workbook rates highest per dollar, with the specification that matters for each.

Measure the room

A night of readings tells you which pillar to fix first.

• Thermometer and hygrometer with min-max memory

  Shows what the room did at 3 a.m., not just at bedtime. Look for humidity accuracy of about 3% and a display you can read without an app.

  See options on Amazon
• CO2 monitor with an NDIR sensor

  The only way to know whether a closed door matters in your room. Avoid "eCO2" models that estimate CO2 from other gases.

  See options on Amazon
• Sound level meter

  A max-hold reading overnight shows the peaks that wake you. A phone app is enough to start.

  See options on Amazon
• Light meter (lux meter)

  Tells you whether the evening light at your eye is under 10 lux. Phone apps are rough but fine for under 10 versus over 100.

  See options on Amazon

Bedroom fixes

The fixes with the best return per dollar, cheapest first.

• Contoured sleep mask

  The cheapest way to a dark night. Contoured cups that do not press on the eyes, an adjustable strap, washable.

  See options on Amazon
• Foam earplugs, variety pack

  Rated 25 to 33 dB. Try several shapes; roll them tightly before inserting or they block a fraction of the noise.

  See options on Amazon
• White or pink noise machine

  Genuine broadband noise, not a short loop, with volume that goes down to under 45 dB at 3 feet and a display that turns off.

  See options on Amazon
• Blackout curtains or blind liner

  Look for side channels or a wrap-around track; a gap at the edge lets in enough light to register.

  See options on Amazon
• Warm dimmable bulbs (2,700 K or lower)

  For bedroom and bathroom lamps in the last two hours before bed. Check the bulb is compatible with your dimmer.

  See options on Amazon
• Quiet fan with a DC motor

  Moving air cools you even when the room stays warm. DC motors run under 35 dB on low.

  See options on Amazon
• Mattress and pillow allergen encasements

  Woven fabric with pores under 10 microns, zipped, washable at 140 °F (60 °C).

  See options on Amazon
• HEPA air purifier

  True HEPA (H13), a clean-air delivery rate at least twice the room volume per hour, a night mode under 30 dB, and no ionizer or ozone function. It cleans particles, not CO2.

  See options on Amazon

Supplements discussed in the workbook

The workbook puts the room, the timing and CBT-I first; supplement effects are small. If you and your clinician decide to try one, choose a third-party tested product (USP or NSF). Check any supplement with your pharmacist, especially with other medicines, in pregnancy, or with liver or kidney disease.

• Melatonin, low dose

  Best evidence for jet lag and a late body clock; sleep onset about 7 minutes faster on average. Product content varies widely, so third-party testing matters.

  Not for pregnancy without advice; prescription-only in some countries. Grogginess and vivid dreams at higher doses.

  See options on Amazon
• Magnesium glycinate

  May help when intake is low; the evidence is limited. The workbook range is 200 to 350 mg of elemental magnesium in the evening.

  Separate from some antibiotics and osteoporosis medicines by 2 hours; ask first with kidney disease.

  See options on Amazon
• Glycine

  Small trials of 3 g before bed found better reported sleep quality and less next-day fatigue.

  Long-term data are limited.

  See options on Amazon

Prices and availability change on Amazon. This page is educational and is not medical advice; talk to your doctor or pharmacist before starting a supplement.