Core Temp (Tc)
36.8°C
Nadir drop: -0.4°C
Mean Skin (Tsk)
34.2°C
Elevated gradient
Distal-Proximal Grad (DPG)
-0.2°C
Vasodilation Stalled
Heart Rate Strain
68 bpm
+12 bpm vs thermo-neutral
Restorative Sleep (SWS+REM)
2.1 hrs
Deficit: -42%
Timeline Scrubber: 22:00 (Sleep Onset)
Sleep Stage: Wake
PHYSIOLOGICAL TEMPERATURE & AUTONOMIC STRAIN (8-HR NOCTURNAL WINDOW)
Core (Tc)
Skin (Tsk)
DPG
HR (bpm/2)
NOCTURNAL HYPNOGRAM & HEAT-INDUCED MICRO-AROUSALS
Wake
REM
N1
N2
SWS (Deep)
NOCTURNAL HEAT DISSIPATION FLUX (W/m²)
Total Loss: 42.1 W/m² (Required: 48 W/m²)
Radiation: 14.7 W
Convection: 10.5 W
Evaporation: 16.9 W
Storage: +5.9 W (Heat Debt)
Thermal Scenarios
Ambient Microclimate
29.5 °C
78 %
0.10 m/s
Physiological Interventions
0.80 clo
Physiological Mechanism:
To enter restorative Slow-Wave Sleep (SWS), the circadian pacemaker triggers distal vasodilation (hands/feet warming), radiating heat to lower core temperature ($T_c$) by ~1.0°C. High ambient heat & humidity blunt this gradient ($DPG \le 0$), forcing sympathetic cardiac arousal and fragmenting sleep architecture.