• Cycle 1 (4 weeks): use diffused "Natural Compound A" (essential oil) in a diffuser every night when sleeping
• Cycle 2 (4 weeks): will not use compounds/diffuser (wash-out period)
• Cycle 3 (4 weeks): use diffused "Natural Compound B" (essential oil) in a diffuser every night when sleeping
• Cycle 4 (4 weeks): will not use compounds/diffuser (post-intervention observation period)
• Cycle 3 (4 weeks): use diffused "Natural Compound C" (control) in a diffuser every night when sleeping
• Cycle 4 (4 weeks): will not use compounds/diffuser (post-intervention observation period)

There will be 3 natural compounds; the intervention compounds essential oils and are commercially available and there is a control compound (water). They will be used as intended with diffusers.

• Cycle 1 (4 weeks): use diffused "Natural Compound B" (essential oil) in a diffuser every night when sleeping
• Cycle 2 (4 weeks): will not use compounds/diffuser (wash-out period)
• Cycle 3 (4 weeks): use diffused "Natural Compound C" (control) in a diffuser every night when sleeping
• Cycle 4 (4 weeks): will not use compounds/diffuser (post-intervention observation period)
• Cycle 3 (4 weeks): use diffused "Natural Compound A" (essential oil) in a diffuser every night when sleeping
• Cycle 4 (4 weeks): will not use compounds/diffuser (post-intervention observation period)

There will be 3 natural compounds; the intervention compounds essential oils and are commercially available and there is a control compound (water). They will be used as intended with diffusers.

Participants will use "Natural Compound A" in a diffuser every night for 4 weeks. Diffuser will be placed near participant's bed and will be used during the entire time they are asleep (about 8 hours, every night).

Change in resting heart rate measured by wearable devices

Change in resting heart rate measured by wearable devices

Duration of each sleep stage [i.e. light, deep, rapid eye movement (REM), wake stages] overnight. Sleep quality will be measured via a wearable device. Sleep quality will be compared to baseline through the other intervention phases.

Change in mood states, a 65 item scale that allow for the quick assessment of transient, fluctuating feelings and enduring affect states.

Change in personal metabolic states as measured in microsampling by targeted and untargeted metabolomics-- liquid chromatography mass spectrometry (LC-MS)-- compared to baseline through the other intervention phases. Dry blood samples will be collected by microsampling bi-weekly at a consistent time in the morning. Based on those samples, metabolomics (e.g., short-chain fatty acids, amino acids and other polar and nonpolar metabolites) will be extracted and quantified by LC-MS.