Studies have shown that kiwifruit contains a variety of medicinally active substances, including antioxidants and serotonin, which may be helpful in the treatment of sleep disorders. In summary, 2 kiwifruit consumed 1 hour before bedtime every night for 4 weeks increased sleep onset, length, and productivity in adults with self-reported sleep disturbances. Overall, kiwifruit consumption may improve sleep quality.
Lin, H.-H., Tsai, P.-S., Fang, S.-C., & Liu, J.-F. (2011). Effect of kiwifruit consumption on sleep quality in adults with sleep problems. Asia Pacific Journal of Clinical Nutrition, 20(2), 169–174.