Rihanna: "I Can't Sleep"

5 January 2012, 06:54 | Updated: 5 January 2012, 07:02

The 'We Found Love' singer posts a message on Twitter to suggest she is having difficulty coping with so much time off.

Rihanna has admitted that she is having trouble sleeping following the completion of her massive worldwide tour and busy schedule in 2011.

The 'You Da One' singer took to her Twitter account this morning (5th January) to explain she is deep in thought and struggling to find time to relax.

"Waited all yr+Finally I have time off, time 4 rest n quiet.Suddenly all the silence is being drowned by my thoughts! No sleep #HEAVY #SCARY," she tweeted.

The Bajan star has been the subject of speculation surrounding her ex boyfriend Chris Brown recently after posting cryptic messages on the social networking site, with The Sun reporting that her close friends are worried about a possible reconciliation between the pair.

Meanwhile, Rihanna is currently only scheduled to perform one live show in 2012 so far with an appearance at the Wireless Festival in Hyde Park London this July.

Rihanna also stars in Capital FM's brand new advert for 2012 alongside Jessie J, Labrinth and Ed sheeran.