I had another brain injury friend recommend melatonin and it's worked great for me. I use 2.5 MG sublingual (brand is Source Naturals) and I take it 30 minutes before bedtime. The sublingual (dissolves under the tongue) type and dosage was the key to not feeling groggy in the morning. It took trial and error to find what works for me. After using it for 2 months my sleep routine regulated and I don't need it anymore. Don't give up. Find out what works for you - it honestly makes a huge difference in how I feel and operate cognitively.