Methods and devices for improving sleep performance in subject exposed to light at night

A method for improving sleep performance in a subject, comprising:

• a) exposing the subject to an artificially lighted environment at night, wherein said exposing step causes one or more of the following in the subject:
• increased sleep onset latency;
• decreasing in total sleep time;
• increasing in wake after sleep onset;
• and
• increasing time in slow wave (stage 3 and 4) sleep and
• b) improving sleep performance after exposure to the artificially lighted environment by selectively substantially blocking retinal exposure of the subject to light of wavelengths less than 480 nm +/−5 nm during the night, wherein said improving of sleep performance comprises one or more of reducing sleep onset latency, increasing total sleep time, reducing wake after sleep onset, and increasing time in slow wave (stage 3 and 4) sleep.

A method for improving sleep performance in a subject, comprising:

• a) exposing a the subject to an artificially lighted environment at night, wherein said exposing step causes one or more of the following in the subject:
• increased sleep onset latency;
• decreasing in total sleep time;
• increasing in wake after sleep onset;
• and
• increasing time in slow wave (stage 3 and 4) sleep and
• b) improving sleep performance after exposure to the artificially lighted environment by selectively substantially blocking retinal exposure of the subject to light of wavelengths selected from the group consisting of between 410 nm +/−5 nm and 490 nm +/−5nm;
• between 415 nm +/−5 nm and 490 nm +/−5 nm;
• between 420 nm +/−5 nm and 490nm +/−5 nm;
• between 425 nm +/−5 nm and 490 nm +/−5 nm;
• between 410 nm +/−5 nm and 480 nm +/−5nm;
• between 415 nm +/−5 nm and 480 nm +/−5 nm;
• between 420 nm +/−5nm and 480nm +/−5 nm;
• and between 425 nm +/−5 nm and 480 nm +/−5 nm during the night, wherein said improving of sleep performance comprises one or more of reducing sleep onset latency, increasing total sleep time, reducing wake after sleep onset, and increasing time in slow wave (stage 3 and 4) sleep.