Selective orexin-2 receptor antagonists
Seltorexant, an investigational selective orexin-2 receptor antagonist, has shown promise in treating insomnia comorbid with depression.[211]Brooks S, Jacobs GE, de Boer P, et al. The selective orexin-2 receptor antagonist seltorexant improves sleep: an exploratory double-blind, placebo controlled, crossover study in antidepressant-treated major depressive disorder patients with persistent insomnia. J Psychopharmacol. 2019 Feb;33(2):202-9.
http://www.ncbi.nlm.nih.gov/pubmed/30644312?tool=bestpractice.com
Melatonin
Melatonin, a neurohormone that regulates circadian rhythm disruption, is available over the counter in some countries for the treatment of jet lag. In other countries, it may only be available by prescription. Meta-analysis of its use in primary sleep disorders shows some evidence for reducing sleep onset latency, but larger randomised controlled trials are needed to establish therapeutic use.[172]Auld F, Maschauer EL, Morrison I, et al. Evidence for the efficacy of melatonin in the treatment of primary adult sleep disorders. Sleep Med Rev. 2017 Aug;34:10-22.
http://www.ncbi.nlm.nih.gov/pubmed/28648359?tool=bestpractice.com
5HT2A antagonists
5HT2A antagonists may help to improve sleep maintenance and have effects on sleep architecture that include increases in slow-wave sleep.[212]Hoyer D, Allen A, Jacobson LH. Hypnotics with novel modes of action. Br J Clin Pharmacol. 2020 Feb;86(2):244-9.
https://bpspubs.onlinelibrary.wiley.com/doi/10.1111/bcp.14180
http://www.ncbi.nlm.nih.gov/pubmed/31756268?tool=bestpractice.com
These agents are in development.
Anticonvulsants
Gabapentin has been shown to increase slow-wave sleep and sleep efficiency, and decrease arousals in persons with primary insomnia; however, further studies are needed.[213]Lo HS, Yang CM, Lo HG, et al. Treatment effects of gabapentin for primary insomnia. Clin Neuropharmacol. 2010 Mar-Apr;33(2):84-90.
http://www.ncbi.nlm.nih.gov/pubmed/20124884?tool=bestpractice.com
[214]Liu GJ, Karim MR, Xu LL, et al. Efficacy and tolerability of gabapentin in adults with sleep disturbance in medical illness: a systematic review and meta-analysis. Front Neurol. 2017 Jul 14;8:316.
https://www.frontiersin.org/journals/neurology/articles/10.3389/fneur.2017.00316/full
http://www.ncbi.nlm.nih.gov/pubmed/28769860?tool=bestpractice.com
Alternative therapies
Alternate approaches to CBT-I have been studied, although the results have been inconclusive. Alternative approaches include aromatherapy - the rationale being that such exposure reduces sympathetic activity.[215]Her J, Cho MK. Effect of aromatherapy on sleep quality of adults and elderly people: a systematic literature review and meta-analysis. Complement Ther Med. 2021 Aug;60:102739.
https://www.sciencedirect.com/science/article/pii/S0965229921000807
http://www.ncbi.nlm.nih.gov/pubmed/34166869?tool=bestpractice.com
Religion and spirituality has been proposed as an intervention for insomnia.[216]de Diego-Cordero R, Acevedo-Aguilera R, Vega-Escaño J, et al. The use of spiritual and religious interventions for the treatment for insomnia: a scoping review. J Relig Health. 2022 Feb;61(1):507-23.
http://www.ncbi.nlm.nih.gov/pubmed/32803656?tool=bestpractice.com
Hypnotherapy has also been proposed as a treatment modality, owing to studies suggesting that deep sleep waves increase among healthy people in hypnotic states, although research on this topic is hampered by the absence of a standard definition of hypnotic states.[217]Mamoune S, Mener E, Chapron A, et al. Hypnotherapy and insomnia: a narrative review of the literature. Complement Ther Med. 2022 May;65:102805.
https://www.sciencedirect.com/science/article/pii/S0965229922000073
http://www.ncbi.nlm.nih.gov/pubmed/35074550?tool=bestpractice.com
Other approaches include trigeminal nerve stimulation and acupuncture.[218]Curry G, Cheung T, Zhang SD, et al. Repeated electrical vestibular nerve stimulation (VeNS) reduces severity in moderate to severe insomnia; a randomised, sham-controlled trial; the modius sleep study. Brain Stimul. 2024 Jul-Aug;17(4):782-93.
https://www.brainstimjrnl.com/article/S1935-861X(24)00092-5/fulltext
http://www.ncbi.nlm.nih.gov/pubmed/38797370?tool=bestpractice.com
[219]Yin X, Li W, Liang T, et al. Effect of electroacupuncture on insomnia in patients with depression: a randomized clinical trial. JAMA Netw Open. 2022 Jul 1;5(7):e2220563.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2793930
http://www.ncbi.nlm.nih.gov/pubmed/35797047?tool=bestpractice.com
[220]Zhao FY, Spencer SJ, Kennedy GA, et al. Acupuncture for primary insomnia: effectiveness, safety, mechanisms and recommendations for clinical practice. Sleep Med Rev. 2024 Apr;74:101892.
http://www.ncbi.nlm.nih.gov/pubmed/38232645?tool=bestpractice.com
[221]Liu C, Xi H, Wu W, et al. Placebo effect of acupuncture on insomnia: a systematic review and meta-analysis. Ann Palliat Med. 2020 Jan;9(1):19-29.
https://apm.amegroups.org/article/view/34506/27944
http://www.ncbi.nlm.nih.gov/pubmed/32005059?tool=bestpractice.com
Tai chi, along with mindfulness and paradoxical intention approaches, are additional interventions used in the management of insomnia, and have produced positive results.[222]Siu PM, Yu AP, Tam BT, et al. Effects of tai chi or exercise on sleep in older adults with insomnia: a randomized clinical trial. JAMA Netw Open. 2021 Feb 1;4(2):e2037199.
https://jamanetwork.com/journals/jamanetworkopen/fullarticle/2776441
http://www.ncbi.nlm.nih.gov/pubmed/33587135?tool=bestpractice.com
[223]Ong JC, Ulmer CS, Manber R. Improving sleep with mindfulness and acceptance: a metacognitive model of insomnia. Behav Res Ther. 2012 Nov;50(11):651-60.
https://pmc.ncbi.nlm.nih.gov/articles/PMC3466342
http://www.ncbi.nlm.nih.gov/pubmed/22975073?tool=bestpractice.com
[224]Jansson-Fröjmark M, Alfonsson S, Bohman B, et al. Paradoxical intention for insomnia: a systematic review and meta-analysis. J Sleep Res. 2022 Apr;31(2):e13464.
https://onlinelibrary.wiley.com/doi/10.1111/jsr.13464
http://www.ncbi.nlm.nih.gov/pubmed/34405469?tool=bestpractice.com