Sleep and overnight recovery

What we know about collagen and sleep

Sleep is a newer and exciting area of collagen research. Early studies show promising results, and the biological rationale — collagen is rich in glycine, an amino acid linked to relaxation and sleep quality — adds to the interest.

The short version

Two independent studies have found positive results for collagen and sleep quality. One used gold-standard sleep measurement and found fewer nighttime awakenings, while another found reduced morning fatigue and improved energy levels. The glycine content of collagen provides a plausible explanation for these benefits.

The studies

The sleep quality study (2024). A well-designed crossover trial enrolled 13 physically active men who reported sleep concerns. Each participant completed two 7-night periods: collagen peptides (15 g taken one hour before bed) and placebo, with a rest period between them. Using gold-standard sleep measurement technology, the researchers found fewer awakenings during the night in the collagen group, along with improved cognitive performance the following day.

The fatigue and energy study (2024). A separate trial with 66 adults who experienced daily fatigue found that 10 g/day of collagen peptides for 8 weeks significantly reduced morning fatigue and significantly improved energy and vitality scores. This is the first trial directly showing collagen reduces next-morning tiredness, adding a second positive result to the sleep category.

The glycine connection (2024). A comprehensive review of 52 glycine studies found that glycine supplementation improved sleep quality in healthy adults, with the nervous system showing the most consistent positive effects. Since collagen is naturally rich in glycine, this provides a clear biological explanation for the sleep benefits seen in collagen trials.

What this means for you

If you’re already taking collagen for other reasons (joints, skin, recovery) and you’re curious about timing: shifting your dose to before bed is a simple way to potentially gain sleep benefits alongside the benefits you’re already getting.

If you’re interested in supporting sleep quality: The early results are encouraging, and taking collagen before bed is an easy addition to your evening routine. Collagen is well-tolerated and the bedtime timing aligns with the research.

If you’re following the science: This is a space worth watching. The biological rationale (glycine content) is well-established, two independent studies show positive results, and further research is expected to build on these early findings.

The takeaway

Collagen before bed is an exciting and practical approach that combines well-established supplement benefits (joints, skin, recovery) with promising sleep support. Two independent studies and a strong biological rationale make this one of the more interesting emerging areas in collagen research. As more studies are published, we’ll continue to update this page with the latest findings.