People with short hair get affected by bed head easier than people with long hair.
「寝ぐせ」は「bed head」と言います。
髪が短い方が寝ぐせが付きやすい
It's easier to get bed head with short hair.
髪が短い人が髪が長い人より髪ぐせにつきやすい
People with short hair get affected by bed head easier than people with long hair.
People with shorter hair are more likely to get bed hair.
髪 - hair
短い – short
寝るせ – bed hair
ありやすい – more likely
「~やすい」は “more~ ” という意味です。
例文：
信じやすい – more likely to believe
しやすい – more easy to do
光に感じやすい – more sensitive to light
アメリカ合衆国 
日本 
