Two-process model equations and parameters

From Achermann & Borbély (1994):

Homeostatic Process S:

Circadian Process C:

Interaction between S and C:

Parameter values:

Parameter values used in the present simulation (initial settings):

Level of thresholds: Lm=Hm-0.445 (1)

Phase of Process C: to=-1.6 hours (1)

All other parameters and equations were implemented as indicated on the left.

Note: Daan et al. (1984) formulated the model with an amplitude of +0.12 and a phase of +8.6 hours, which means in combination that the phase of their Process C was 1.8 hours earlier.

(1) differs from published value

 

 

 

©1998 BITS OF SLEEP (Demo) : Regulation of sleep: The two-process model.