This pilot study will assess feasibility and to obtain initial estimates of efficacy of Sleep Activity and Task Effectiveness (SAFTE) model, which can accurately estimate the impact of scheduling factors and sleep history on both safety and productivity. The SAFTE model will be used to asses cancer-related fatigue and study potential associations of change in sleep patterns to tumor recurrence in patients with high grade glioma. Data will be collected using the Readiband™ Sleep Tracker (https://www.fatiguescience.com/sleep-science-technology/). The Readiband device captures high-resolution sleep data, validated against the clinical gold standard of polysomnography with 92% accuracy. Sleep data is transmitted to the cloud automatically for SAFTE Fatigue Model analysis. We will correlate clinical progression data obtained from the patient's electronic medical record with SAFTE data.

Inclusion Criteria

i. Patients aged between 22 and 70. ii. Patients must have a histologic diagnosis of primary Grade IV glioma. iii. Patients must have received maximal debulking surgery and radiotherapy concomitant with Temozolomide (≥ 75% of their recommended temozolomide dosage is required).

iv. Patients with KPS ≥70. v. Life expectancy at least 3 months. vi. Patients must have signed informed consent for study participation. vii. Patients should be English speakers.

Exclusion Criteria

i. Patients enrolled in active clinical treatment trials for primary Grade IV glioma.

ii. Patients with progressive disease after completion of radiotherapy concomitant with Temozolomide as per RANO criteria. Suspected pseudoprogression should be confirmed by additional imaging studies ordered as part of standard care.

iii. Patients with known other active malignancy diagnosed in the past 3 years (except for in situ malignancies).

iv. Patients who are pregnant or trying to get pregnant. v. Patients unable to wear the ReadiBand device continuously during study duration.

vi. Patients with infra-tentorial tumors. vii. Patients with known psychiatric concerns. viii. Significant co-morbidities at baseline which would prevent maintenance Temozolomide treatment:

1. Thrombocytopenia (platelet count < 100 x 103/μL)
2. Neutropenia (absolute neutrophil count < 1.5 x 103/μL)
3. CTC grade 4 non-hematological Toxicity (except for alopecia, nausea, vomiting)
4. Significant liver function impairment - AST or ALT > 3 times the upper limit of normal
5. Total bilirubin > upper limit of normal, if clinically significant
6. Significant renal impairment (serum creatinine > 1.7 mg/dL)

Patients with Grade IV gliomas treated at Abbott Northwestern Hospital's Givens Brain Tumor Center will comprise the study population. Patients enrolled in this study must intend to complete post-surgery chemoradiation as part of their standard treatment. Twenty-five patients will prospectively be included in the study. Aggregate fatigue data and sleep patterns for a group of 30 healthy controls will be procured from FatigueScience in a de-identified manner for data analysis purposes.