Measuring and estimating alertness

A computer system comprising:

• at least one processor;
• at least one memory storing a computer program code, wherein the at least one memory and the computer program code are configured, with the at least one processor, to cause the apparatus to perform operations comprising:
• receiving measurement data measured by at least one sensor device on a user during a time interval;
• computing, from the measurement data, a sleep quality metric indicating a quality of the user's sleep during the time interval, wherein the sleep quality is computed on the basis of a total sleep time, an amount of REM sleep detected from the measurement data, an amount of deep sleep detected from the measurement data, and sleep continuity detected from the measurement data;
• determining the user's circadian rhythm;
• and
• estimating, on the basis of at least the sleep quality metric and the circadian rhythm, an alertness metric indicative of a current or future alertness level of the user.

A computer program product embodied on a non-transitory distribution medium and comprising a computer-readable program code that, when read and executed by a computer system, cause execution of a computer process comprising:

• receiving measurement data measured by at least one sensor device on a user during a time interval;
• computing, from the measurement data, a sleep quality metric indicating a quality of the user's sleep during the time interval, wherein the sleep quality is computed on the basis of a total sleep time, an amount of REM sleep detected from the measurement data, an amount of deep sleep detected from the measurement data, and sleep continuity detected from the measurement data;
• determining the user's circadian rhythm;
• and
• estimating, on the basis of at least the sleep quality metric and the circadian rhythm, an alertness metric indicative of a current or future alertness level of the user.