this code:
%%%%%%%%%%%%%%%%%%Table: Valence x valence crosstab
\begin{table*}[t]
\centering
\begin{tabular}{c c c c c c c}
\toprule
\midrule
& & \multicolumn{5}{c}{Predicted valence }\\
\cmidrule{3-7}
&& Negative & Little negative & Neutral & Little positive & Positive \\
\cmidrule{3-7}
\multicolumn{1}{c}{\multirow{5}{*}{\begin{sideways}Actual valence\end{sideways}}} &
\multicolumn{1}{l}{Negative}& 59.0 & 18.0 & 17.3 & 5.8 & \\
\multicolumn{1}{c}{} &
\multicolumn{1}{l}{Little negative}& 0.9 & 66.6 & 16.7 & 10.7 & 5.1 \\
\multicolumn{1}{c}{} &
\multicolumn{1}{l}{Neutral} &1.4 & 16.6 & 70.8 & 8.0 & 3.1 \\
\multicolumn{1}{c}{} &
\multicolumn{1}{l}{Little positive} &0.3 & 11.2 & 20.0 & 68.0 & .5 \\
\multicolumn{1}{c}{} &
\multicolumn{1}{l}{Positive} & 4.9 & 7.8 & 17.5 & 69.9 \\
\midrule
\bottomrule
\end{tabular}
\centering
\caption{Classification results for the valence dimension.}
\label{tab:sam_count}
\end{table*}
%%%%%%%%%%%%%%%%%
porduces this:
I want the vertical text "actual valence" to have an newline in between.
How to I accomplish this?