Light has always fascinated humans but ever since the invention of the first light bulb, the use of artificial lighting has accelerated dramatically. Darkness has never been as rare as today and the overuse of lighting has created a new phenomenon called light pollution. Most living beings are biologically dependent on the recurrent twenty-four-hour rhythm of light and darkness, called the Circadian cycle. Human beings are evolutionary developed after this Circadian rhythm and the effects of constant artificial light is yet unknown. Scientists fear the consequences of constant lighting and what it means physically, mentally and philosophically for the human species.

Among researchers it has been established since decades that humans and animals have an internal biological clock that controls certain physiological mechanisms. One example regarding humans is the impairment of lung function during the night, causing the phenomenon ?nocturnal asthma? among asthmatics. Only a few studies concerning respiratory Circadian rhythm in horses have been done previously and they showed a daily variation in horses with a chronic or an acute respiratory disease. The technique used in those studies was the conventional technique, which is invasive and less sensitive than the technique used in this study.

Background: The population of the world is getting older and in the year of 2020, 1.2 billion people will be 60 years or older. A common health complaint affecting the quality of life in elderly persons are sleep difficulties. Physical activity is claimed to improve sleep quality and the maintenance of a normal Circadian rhythm. Several studies have shown positive effects of physical activity on sleep quality, still the evidence of physical activity as sleep-promoter is insufficient. Aim: The aim of this study was to investigate associations between physical activities and sleep quality in persons ?60 years of age.

Background: The population of the world is getting older and in the year of 2020, 1.2 billion people will be 60 years or older. A common health complaint affecting the quality of life in elderly persons are sleep difficulties. Physical activity is claimed to improve sleep quality and the maintenance of a normal Circadian rhythm. Several studies have shown positive effects of physical activity on sleep quality, still the evidence of physical activity as sleep-promoter is insufficient. Aim: The aim of this study was to investigate associations between physical activities and sleep quality in persons ?60 years of age.

En stor del av personalen inom Hälso- och Sjukvården har sin arbetstid förlagd till natten. Vi vet idag att det är mycket ogynnsamt att arbeta nattetid och att det höjer risken att utveckla flera sjukdomar. Nattarbete och roterande skiftarbete stör och påverkar den naturliga dygnsrytmen i kroppen. Kan vi hjälpa kroppen att anpassa sig bättre till nattskiftsarbete med hjälp av ljusterapins effekter? Ljusterapi är, vad vi känner till idag, en säker behandling med få eller inga biverkningar.

In healthy dogs, heart rate fluctuates during the day. Heart rate variability (HRV) reflects the autonomic nervous system´s regulation of the cardiovascular unit. Heart rate variability shows the balance between the sympathetic and parasympathetic nervous system, also called sympathovagal balance. Heart rate variability can be measured by time domain - and frequency domain analysis. In a time domain analysis you study the beat-to-beat-interval (RR-interval) in an electrocardiogram (ECG), while a frequency domain analysis can be used to determine the size of the variability.

Introduction: Sleep disorders are an increasingly growing public health problem. InSweden, the last decade's increase in sleep problems was greatest among younger agegroups. Studies show association between the use of communication media and sleepinghabits. Objective: The aim is to map sleep habits and use of communication mediumamong adolescents and to study associations between them. Method: The study isbased on a previously collected survey data among high school students (18-21 years)from a coastal town in southern Sweden.

Syfte och frågeställningarSyftet med studien var att få en uppfattning om hur kosten och måltidsmönstret påverkas av en oregelbunden dygnsrytm hos skiftarbetande poliser. Syftet var också att skapa en bild av hur och vilka metoder som används för att skapa goda kost- och sömnrutiner i vardagen. Specifika frågeställningar var hur poliser upplever att deras kostvanor och måltidsmönster påverkas av skiftarbete med en oregelbunden dygnsrytm samt vilka livsstrategier som används för att hantera kost- och sömnvanor som skiftarbetande polis.MetodDatainsamlingen är baserad på intervjuer med fyra poliser, två kvinnliga och två manliga i åldrarna 26 till 37 år, som arbetar i en närförort till Stockholm. Respondenterna valdes ut med hjälp av bekvämlighetsurval via en bekant inom polisen. Samtliga deltagare kontaktades via telefon för att bli informerade om studiens syfte, frågeställningar, genomförande, för att boka in tid för intervju och blev dessutom upplysta om att de har full anonymitet i studien.