 Fatigue is one of the most consistent and distressing symptoms reported by pediatric oncology patients. The investigators work has demonstrated that in the period from diagnosis through the initial 8 weeks of treatment, adolescents and young adults with solid tumors experience substantial fatigue that is not related to sleep disruption. Fatigue can contribute to many adverse outcomes including poor treatment adherence, reduced social activities, depressive symptoms, behavior problems, and poorer quality of life. Unfortunately, no definitive intervention to reduce fatigue has been developed for pediatric oncology patients. Investigators propose a study to estimate the feasibility and acceptability of bright light therapy as an intervention to decrease fatigue in adolescents and young adults who are newly diagnosed and receiving treatment for solid tumors, including lymphoma. 