The sativa part could likely be the problem. Look for a strain with a CBD percentage of 1% or higher. They will be more relaxing. Below is one option that might be worth considering.
Green House Seeds Big Bang Feminised
Genetics:
Skunk, Northern Light, El Niño.
Effect: Very known for its medicinal properties, it is sold in the Dutch pharmacies as prescription medicine.
Relaxing and calming effect.
Flowering indoor:
9 weeks will guarantee the full range of cannabinoids. Commercially ready in 8 weeks. Yield up to 800 gr/sqm.
Very good on SOG and ScrOG systems.
Flowering outdoor:
Ready at the beginning of October in the Northern hemisphere and in April in the Southern one. Yield up to 1000 gr/plant.
THC: 15.5%
CBD: 1.5%
CBN: 0.4%