Sleep signal conditioning device for a sleep monitor, the device comprising: - a first processing unit configured to provide a first parameter indicative of the magnitude of a first sensor signal sensed by a first sleep sensor configured to sense a physiological signal from a sleeping mammal; - a second processing unit configured to provide a second parameter indicative of the magnitude of a second sensor signal sensed by a second sleep sensor configured to sense a physiological signal from the sleeping mammal, wherein the first sensor signal is different from the second sensor signal; characterized in that the device further comprises: - a clipping detector configured to detect when the first sensor signal is clipping; - a divider configured to calculate a ratio based on dividing the first parameter by the second parameter when the first sensor signal is not clipping; - a multiplier configured to generate an estimated first sensor signal based on multiplying a second output signal based on the second sensor signal by the ratio; and - a switch configured to provide a first output sleep signal based on the estimated first sensor signal when detecting that the first sensor signal is clipping and a first output signal based on the first sensor signal when detecting that the first sensor signal is not clipping. - a first processing unit configured to provide a first parameter indicative of the magnitude of a first sensor signal sensed by a first sleep sensor configured to sense a physiological signal from a sleeping mammal; - a second processing unit configured to provide a second parameter indicative of the magnitude of a second sensor signal sensed by a second sleep sensor configured to sense a physiological signal from the sleeping mammal, wherein the first sensor signal is different from the second sensor signal; characterized in that the device further comprises: - a clipping detector configured to detect when the first sensor signal is clipping; - a divider configured to calculate a ratio based on dividing the first parameter by the second parameter when the first sensor signal is not clipping; - a multiplier configured to generate an estimated first sensor signal based on multiplying a second output signal based on the second sensor signal by the ratio; and - a switch configured to provide a first output sleep signal based on the estimated first sensor signal when detecting that the first sensor signal is clipping and a first output signal based on the first sensor signal when detecting that the first sensor signal is not clipping. - a clipping detector configured to detect when the first sensor signal is clipping; - a divider configured to calculate a ratio based on dividing the first parameter by the second parameter when the first sensor signal is not clipping; - a multiplier configured to generate an estimated first sensor signal based on multiplying a second output signal based on the second sensor signal by the ratio; and - a switch configured to provide a first output sleep signal based on the estimated first sensor signal when detecting that the first sensor signal is clipping and a first output signal based on the first sensor signal when detecting that the first sensor signal is not clipping.