Supplements for deeper sleep?

I’ve found that 3 grams of glycine + magnesium (200mg) taken 1-2 hours before bed has improved my sleep quality ( + optional 25-50 mg CBD). Also no caffeine after noon.

The Sleep-Promoting and Hypothermic Effects of Glycine are Mediated by NMDA Receptors in the Suprachiasmatic Nucleus (nih.gov)

The Connection Between Glycine and Sleep - The Sleep Doctor

New therapeutic strategy for amino acid medicine: glycine improves the quality of sleep - PubMed (nih.gov)