Critical Smoke Alarm Characteristics to Awaken Children From Stage 4 Sleep

Inclusion Criteria: * Child is at least 5 years of age and has not yet had his/her thirteenth birthday (for Studies # 1, 2, and 5). * Subject (and child's caretaker for Studies #1, 2, and 5) speak English (2000 Census data indicate that less than 5% of the population older than five years of age in Franklin County, Ohio \[where the study is located\] speaks English less than "very well"). * Subject/family is able to be contacted by telephone (to obtain pre-study information and to remind the family about the study appointment and confirm that the child is in a normal state of health on day of study). * For adult study arms: Study 3: Subjects are 20-49 years of age; Study 4: Subjects are 60-84 years of age. Exclusion Criteria: * Subject has a clinical diagnosis that may affect sleep, arousal or ability to perform the escape procedure. * Subject has a hearing impairment. * Subject is taking medication that may affect sleep, arousal, or ability to perform the escape procedure. * Subject has an acute illness at the time of the sleep study. The target population for Study 3 consists of adults 20-49 years of age, who have not yet had his/her fiftieth birthday. Adult participants must not have a clinical diagnosis that may affect sleep, arousal or ability to perform the simulated escape procedure. He/she must not have a hearing impairment; not be taking medication that may affect sleep, arousal, or ability to perform the escape procedure; and not have an acute illness at the tim…