Patent ID: 11883194
Assignee: THE GOVERNMENT OF THE UNITED STATES, AS REPRESENTED BY THE SECRETARY OF THE ARMY
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 0:
1. A method for determining an alertness level of an individual using a computing device having a processor, a memory, a display, and a receiving means for receiving input from the individual about the individual including a caffeine consumption, the method comprising:
obtaining sleep-wake data for the individual,
storing the obtained sleep-wake data,
storing the caffeine consumption in the memory as caffeine consumption data as the caffeine consumption is received from the receiving means,
determining the alertness level for the individual with an alertness model based on the stored data including the sleep-wake data and the caffeine consumption data, and
displaying the alertness level on the display and a user and/or the individual acts on the displayed alertness level to address any fatigue and/or impairment of the individual as represented by the displayed alertness level; and
wherein the alertness model includes
a homeostatic component having a sleep debt lower asymptote that varies based on a sleep debt for the individual and a sleep debt upper asymptote, the homeostatic component increases exponentially with time awake and decreases exponentially with sleep time to a basal value, the homeostatic component uses the sleep-wake data;
a circadian component with an adjustable circadian amplitude; and
a caffeine component that provides a multiplicative impact on a sum of the homeostatic component and the circadian component, the caffeine component uses the caffeine consumption data present in the memory at distinct dosage times to provide an exponential decay of the caffeine consumption over time, the caffeine component is equal to 1 prior to a first time of distinct caffeine consumption data is present in the memory.