Morningness-eveningness and lifestyle regularity

Area of Science:

• Chronobiology
• Sleep Science
• Behavioral Science

Background:

• Human circadian rhythms influence daily behavior.
• Individual differences in morningness-eveningness preference exist.
• Lifestyle regularity is a key aspect of daily functioning.

Purpose of the Study:

• To investigate the relationship between morningness-eveningness preference and lifestyle regularity.
• To determine if morning types have more regular lifestyles than evening types.

Main Methods:

• 100 healthy adults (20-59 years) completed the Composite Scale for Morningness (CSM).
• Lifestyle regularity was assessed using the Social Rhythm Metric diary (SRM-5) over two weeks.
• Participants were categorized into morning (M-types), intermediate (I-types), and evening (E-types) based on CSM scores.

Main Results:

• Significant differences in lifestyle regularity (SRM scores) were found across the three groups (p < 0.001).
• Evening types (SRM=3.6) were least regular, followed by intermediate types (SRM=4.0), and morning types (SRM=4.9) were most regular.
• A significant positive correlation (rho=0.428, p < 0.001) was observed between morningness and lifestyle regularity, weakening when age was controlled.

Conclusions:

• Morning types demonstrate greater daily lifestyle regularity compared to evening types.
• This suggests a connection between circadian timing preferences and the consistency of daily routines.
• Further research is needed to explore the influence of age on this relationship.