  Measurements of the production of muons from heavy-flavour hadron decays at
forward rapidity ($2.5 < y < 4.0$) in Pb--Pb collisions at $\sqrt{s_{\rm NN}} =
2.76$ and 5.02 TeV with the ALICE detector are presented along with the $R_{\rm
AA}$ measurements in different centrality intervals as a function of transverse
momentum, $p_{\rm T}$. Results of the measured $R_{\rm AA}$ at both energies
are shown and are compared to the different model predictions.
