Sources:

1. Bootzin, R. R. (1972). Stimulus control treatment for insomnia. Proceedings of the American Psychological Association, 7, 395–396.

2. Spielman, A. J., Caruso, L. S., & Glovinsky, P. B. (1987). A behavioral perspective on insomnia treatment. Psychiatric Clinics of North America, 10(4), 541–553.

3. Jacobson, E. (1938). Progressive Relaxation: A Physiological and Clinical Investigation of Muscular States and Their Significance in Psychology and Medical Practice. University of Chicago Press.

4. Falcão, L. et al. (2026). Progressive muscle relaxation technique improves sleep quality and mental health: A systematic review and meta-analysis of randomized controlled trials. Journal of Psychosomatic Research, 203, 112563.

5. Zhou, J., Liu, D., Li, X., Ma, J., Zhang, J., & Fang, J. (2012). Pink noise: Effect on complexity synchronization of brain activity and sleep consolidation. Journal of Theoretical Biology, 306, 68–72. https://doi.org/10.1016/j.jtbi.2012.04.006

6. Schade, M. M., Mathew, G. M., Roberts, D. M., Gartenberg, D., & Buxton, O. M. (2020). Overnight exposure to pink noise could jeopardize sleep-dependent insight and pattern detection. Nature and Science of Sleep, 12, 411–429. https://doi.org/10.2147/NSS.S243204

7. Penn Medicine News. (2026). Pink noise reduces REM sleep and may harm sleep quality. https://www.pennmedicine.org/news/pink-noise-reduces-rem-sleep-and-may-harm-sleep-quality

8. Slow breathing techniques before bedtime and the effects on sleep: A systematic review. (2025). PubMed. https://pubmed.ncbi.nlm.nih.gov/41886931/

9. Effects of slow breathing rate on heart rate variability and arterial baroreflex sensitivity in essential hypertension. National Library of Medicine. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6392805/

10. Ong, J. C., Ulmer, C. S., & Manber, R. (2012). Improving sleep with mindfulness and acceptance: A metacognitive model of insomnia. Behaviour Research and Therapy, 50(11), 651–660.

11. Sleep Foundation. Pink Noise for Sleep: Benefits and How It Works. https://www.sleepfoundation.org/noise-and-sleep/pink-noise-sleep

12. Pigeon, W. R., Carr, M., Gorman, C., & Perlis, M. L. (2010). Effects of a tart cherry juice beverage on the sleep of older adults with insomnia: a pilot study. Journal of Medicinal Food, 13(3), 579–583.

13. Howatson, G. et al. (2012). Effect of tart cherry juice (Prunus cerasus) on melatonin levels and enhanced sleep quality. European Journal of Nutrition, 51(8), 909–916.

14. Lin, H.-H., Tsai, P.-S., Fang, S.-C., & Liu, J.-F. (2011). Effect of kiwifruit consumption on sleep quality in adults with sleep problems. Asia Pacific Journal of Clinical Nutrition, 20(2), 169–174.

15. Rondanelli, M. et al. (2011). The effect of melatonin, magnesium, and zinc on primary insomnia in long-term care facility residents. Journal of the American Geriatrics Society, 59(1), 82–90.

16. Reiter, R. J. et al. (2005). Melatonin in walnuts: influence on levels of melatonin and total antioxidant capacity of blood. Nutrition, 21(9), 920–924.

17. Chang, S.-M., & Chen, C.-H. (2016). Effects of an intervention with drinking chamomile tea on sleep quality and depression in sleep-disturbed postnatal women. Journal of Advanced Nursing, 72(2), 306–315.

18. Sleep Foundation. Foods That Help You Sleep. https://www.sleepfoundation.org/nutrition/food-and-drink-promote-good-nights-sleep