The conventional approach to a concussion --- rest and do nothing --- has come under examination in recent years and is being replaced by a more active path to recovery including vestibular rehabilitation and an earlier graduated return to activity.
Here are three recent research papers on the topic of active concussion recovery:
Coslick, A. M., Chin, K. E., Kalb, L. G., Slomine, B. S., & Suskauer, S. J. (2020). Participation in Physical Activity at Time of Presentation to a Specialty Concussion Clinic Is Associated With Shorter Time to Recovery. PM & R : the journal of injury, function, and rehabilitation, Nagib, S., & Linens, S. W. (2019). Vestibular Rehabilitation Therapy Improves Perceived Disability Associated With Dizziness Postconcussion. Journal of Sport Rehabilitation, 28(7), 764–768. https://doi.org/10.1123/jsr.2018-0021
Willer, B. S., Haider, M. N., Bezherano, I., Wilber, C. G., Mannix, R., Kozlowski, K., & Leddy, J. J. (2019). Comparison of Rest to Aerobic Exercise and Placebo-like Treatment of Acute Sport-Related Concussion in Male and Female Adolescents. Archives of physical medicine and rehabilitation, 100(12), 2267–2275. https://doi.org/10.1016/j.apmr.2019.07.00