take to bed
To get into and remain in one's bed, especially to overcome fatigue or illness. Often used with a possessive pronoun before "bed." I took to bed with the flu for the weekend, so I missed out on the entire festival. Janet's taken to her bed to recover from her 24-hour shift in the hospital.
take to one's bed
to go to bed, as with an illness. I feel a little ill, so I'll take to my bed for a day or so. Sam took to his bed with a fever.
take to your ˈbed
go to bed and stay there because of illness: She has taken to her bed with a bad bout of flu.