Researchers at the intersection of sleep and suicide research have advocated for investigation of sleep disturbances as a therapeutic target for the purposes of treating and preventing suicide. This study aims to provide the first systematic review and meta-analysis on the efficacy of sleep interventions to treat suicidal ideation. This systematic review and meta-analysis, registered with the International Prospective Register of Systematic Reviews, was conducted in PsycINFO, through Ovid. A sample of eight articles were deemed eligible and a total of 21 effect sizes were included. Egger's test suggested that no publication bias was present (b = 0.3695; p = 0.0852). The pooled effect size for sleep treatments on suicidal ideation was small (g = -0.0931, p = 0.3047). Significant heterogeneity was present (I = 44.13%), indicating the need for moderator analyses. Treatment type (medication versus psychotherapy; g = -0.2487, p = 0.3368), sex (g = -0.0007; p = 0.9263), and race (g = -0.0081; p = 0.1624) were all considered as moderators and were all found to be insignificant. This meta-analysis revealed that initial studies exploring the efficacy of sleep interventions on suicidal ideation demonstrate small effect sizes. Despite this, the handful of studies included in this review nonetheless highlight this as an important area for continued exploration. The use of larger and more diverse samples, as well as intentionally designing sleep-related interventions to improve ideation and behaviour, have the potential to enhance the efficacy of sleep interventions for this novel purpose.