4. tips room book dusk check stress Humans switch coffee smoking bedtime gadgets anxiety daytime support problems painting caffeine bed time decrease good form mediation sleep mode substances brightness difficulty body clock body aches good sleep good hours Good Night active mode daily clock good option many lights bright light neck sprains many factors wake-up time human beings sleep issues proper night mild activity mental health healthy sleep sleep schedule afternoon naps Daily exercise proper physical bright sunlight similar schedule moderate exercise lower temperature mental functioning Relaxing exercises Too old mattresses Alcohol consumption bad quality mattress good-quality pillows comfortable environment high-intensity activities