I started using DSIP two weeks ago. I purchased 1 vial for a test. I liked it so much, I ordered a kit. I also take Tesa/Ipa nightly.
While I've had no trouble ever falling asleep, I've had issues waking up in the middle of the night. Sometimes several times, other times waking up way earlier than normal.
Here's what it does and doesn't do according to my experience.
1. It doesn't make me sleepy. It's not like Ambien, or sleep medication, etc.
2. It doesn't make me feel groggy in the morning. If anything, I pretty much have instant energy when I wake up.
3. I track my sleep with a Samsung Galaxy Watch Ultra. I've noticed that my sleep score has gone up. I am spending longer in the Deep Sleep cycle. Where before I was usually getting 30-60 minutes of Deep Sleep a night, I'm now getting 60-90+ minutes a night.
4. I'm waking up less in the middle of the night as well. Most nights, I don't wake up at all.
5. I am dreaming more.