New York ? Demi Lovato's song about relapsing has re-entered the Billboard chart a week after she was hospitalised for a reported overdose. Sober, released last month, jumped to No. 56 this week on the Billboard Hot 100 chart after being absent from the chart last week. Nielsen Music says Sober earned 7.2 million streams and sold 18 000 tracks in the tracking week ending 26 July. Sober turned heads when it was released since the 25-year-old had celebrated six years of sobriety in March.