OBJECTIVE To identify the factors most strongly associated with sleeping less than 6 consecutive hours at night for children aged 5, 17, and 29 months. DESIGN, SETTING, AND PARTICIPANTS A randomized survey design used a representative sample of infants born in 1997-1998 in the Canadian province of Quebec. Data were collected by questionnaires and interviews. Interviews were scheduled at home ...

Tuber formation in potato (Solanum tuberosum) is promoted by short photoperiods and is inhibited by gibberellins (GAs). Endogenous levels of GA1 were shown to decrease in stolons and leaves of potato plants induced to tuberize, which suggests that photoperiodic regulation of GA biosynthesis may play a role in tuber induction. We report the isolation of three potato cDNA clones (StGA20ox1-3) enc...

AIMS To determine the effects of break duration and time of break onset on the amount of sleep that locomotive engineers obtain between consecutive work periods. METHODS A total of 253 locomotive engineers (249 male, 4 female, mean age 39.7 years) participated. Data were collected at 14 rail depots, where participants drove electric or diesel locomotives; worked with another engineer or drove...

OBJECTIVES We aimed to determine whether junior doctors and trusts in the region make use of published evidence relating to best practice during night shift work that can safeguard alertness, reduce fatigue and limit mistakes. We surveyed junior doctors' preparation for and practice during night shifts, and the working and living conditions offered by hospitals for junior doctors carrying out n...