Harmaline is absolutely great for that. About 80 mg orally 1 hour before bed and you’ll have tons of fantastic dreams. Plus, it’s sedative effects help you sleep if you have insomnia.
Jimson weed seeds are actually one of the best herbs for lucid dreaming. About 1-3 seeds is all you need for it. You boil the seeds in water for about 5 minutes and then strain and drink it about 30 minutes before bed.
Note that SWIM has used Jimson weed many times in the past, but never more than once a month. He’s always used very small safe doses, never enough to cause much effect while awake. Jimson weed (Datura stramonium) can be fatal in large doses so be careful if you use it. Do not use more than 10 seeds. Do not handle the seeds or the plant with your bare hands because the active alkaloids can soak into your skin.
Jimson weed seeds contain up to a maximum of 0.7% alkaloids with hyoscyamine being the main alkaloid with a little scopolamine and traces of atropine. 1 seed weighs about 8 mg, so 1 seed can contain up to about 56 micrograms, but 20-30 micrograms is more typical. The pharmaceutical safe adult dosage range for hyoscyamine is up to 1500 micrograms. A typical adult dose of hyoscyamine in oral tablet form is 125 micrograms. I would not recommend going above that. 3 Jimson weed seeds could contain up to 168 micrograms if they are extremely potent, but in most cases 3 seeds will contain about 70 micrograms.
Sometime people take dangerous amounts of Jimson weed to purposely get delirious. That’s a very risky thing to do. Many people have died trying to get delirious from Jimson weed, often eating as much as 50-200 seeds! 50 seeds could contain up to 2800 micrograms of hyoscyamine. That’s nearly twice the recommended maximum safe adult dose of 1500 micrograms and could be fatal for some people.
PLEASE DO NOT USE JIMSON WEED TO GET DELIRIOUS! Even if you don’t die, you might do something really stupid while delirious or even suffer mental problems for many days after that.
Harmaline is generally considered to be safer than hyoscyamine. There are no deaths reported for harmaline that I am away of, but there are many deaths reported from hyoscyamine overdose.