Chronic noise exposure does not hit everyone equally. Sensitive groups include shift workers, children, older adults, and anyone with existing hypertension or anxiety. Typical complaints are difficulty staying asleep, morning headaches, ringing ears after loud nights, and a sense of being constantly on alert. Aircraft events and rail squeal are especially disruptive because they pierce even high insulation peaks.
Physiology in plain language
Night-time arousals raise cortisol and blood pressure even if you do not remember waking. Over months, that pattern is associated with higher cardiovascular risk in epidemiological studies. The effect size is modest per person but meaningful at population scale, which is why WHO tightened Lnight recommendations.
What you can change
Bedroom orientation, secondary glazing, white-noise masking, and political participation on curfews all matter. ClearSpot highlights modelled Lnight and Lden exceedances so you can prioritise bedrooms that sit in quieter pockets of the same flat. If you rent, evidence packs also support conversations with landlords about façade upgrades.